Malicious PDF — malware analysis report

Static analysis result for SHA-256 afccdcfbb2e93d4c…

MALICIOUS

PDF

47.2 KB Created: 2020-07-14 09:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 40326c2e699833869acd44d6e11ba83d SHA-1: bff4b8ad75f6edd9ef230e574fe1428447b7b38d SHA-256: afccdcfbb2e93d4c081788ca528c175e2ac1857fb1ec4ecbd51fe631a7fe9325
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with a critical heuristic firing for a PDF link farm. One of these links, 'https://ttraff.cc/wb?keyword=nuking%20the%20moon%20pdf', points to known malicious redirector infrastructure. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of the link farm and malicious redirector strongly suggests an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wb?keyword=nuking%20the%20moon%20pdf In PDF document text
    • http://files.timthompsonelt.com/uploads/1/3/0/7/130739328/3735414.pdfIn PDF document text
    • http://files.edwardcooperrealty.com/uploads/1/3/1/1/131164568/kiwepafajilof-didibamo-gotexituz-sotixuzaxu.pdfIn PDF document text
    • http://files.jenwilliamsedu.com/uploads/1/3/0/8/130873987/f76a9e78.pdfIn PDF document text
    • http://files.judicheco.com/uploads/1/3/1/6/131607712/9605056.pdfIn PDF document text
    • http://files.brianbustosart.com/uploads/1/3/0/7/130776483/navugopazol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9092/0099/files/54240006350.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/65155335522.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lutekalejore.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/serebenabelemonoduxubero.pdfIn PDF document text
    • https://daxanud289829636.files.wordpress.com/2020/07/56151402131.pdfIn PDF document text
    • https://mekerug368181460.files.wordpress.com/2020/07/budotom.pdfIn PDF document text
    • https://wonoged.files.wordpress.com/2020/07/wuzibimakenaku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1396/3939/files/besalepodotiluwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/63394351636.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dosodasanofesawule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xoxolesusoziviro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xawifakupubegezixezo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3319/8745/files/tigekuzoza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7103/6822/files/7740653098.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/16284649933.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDB 4856 bytes
SHA-256: ee929f6d48be1c16fbc77cce9e9da88be3db4570b3aa67189fb15f708566c2b8
font_01_sfnt_off00008c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C3D 10304 bytes
SHA-256: d683366275bacd3f56a3fd8e4c7fcdd4acacb81da0df4158a8b8caea937d4a54