Malicious PDF — malware analysis report

Static analysis result for SHA-256 990a5c2bd50d538e…

MALICIOUS

PDF

59.7 KB Created: 2020-07-19 21:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: aba35e33d436327221fd3ed5840c2c90 SHA-1: da998fbc4eb9f11e2803f1274fb41170d68ad187 SHA-256: 990a5c2bd50d538e305e66da10af285cebb171620b8b170d5e3d102d0f10ddd2
194 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is ttraff.cc, which is used in conjunction with a keyword suggesting a lure. The document body is heavily obfuscated and unreadable, but the presence of numerous external links, including one to a known malicious redirector, strongly suggests a phishing or malware distribution attempt.

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=is%20god%20mathematician%20pdf In PDF document text
    • http://files.thetrophyshopplus.com/uploads/1/3/1/3/131380177/6124696.pdfIn PDF document text
    • http://files.trentoncyrus5.org/uploads/1/3/1/3/131380295/f9014c.pdfIn PDF document text
    • http://files.store.wabashfriendscounseling.com/uploads/1/3/0/8/130814340/833a7f5.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/1/0430/7058/7029/files/taruxuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/34766209392.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xidab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74535711799.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31906594002.pdfIn PDF document text
    • https://dolasexup.files.wordpress.com/2020/07/zodaxoruzono.pdfIn PDF document text
    • https://baxejubox.files.wordpress.com/2020/06/15491967930.pdfIn PDF document text
    • https://nodezebibun.files.wordpress.com/2020/06/38607803653.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/fudekonopedavijodasuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8338/2427/files/54345775574.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/4626821983.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5280/1954/files/tupuwupa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13139855908.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/tijaredubafaluduligam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/gukaxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/95808458741.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68513135127.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_off0000ad22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD22 5164 bytes
SHA-256: 5590fe11857c796eaf10da91bae2f4495266130cd2056703cd29de83ed38f854
font_01_sfnt_off0000be93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE93 10244 bytes
SHA-256: 3d0f177e5d3bdc77f441a70ce9954d9b1ae19a8229d9a281a3722ca85aa065dc