Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a967c126f5c402…

MALICIOUS

PDF

41.1 KB Created: 2020-07-10 16:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6e15ca626e0236b9e5503b0178f2d53 SHA-1: cda4db93859d3306ca592f671c55dd164340dd1d SHA-256: 71a967c126f5c40281008ac46a1c3fe67746b600f6baccfb04c44f14d9db2a73
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to domains that appear to be part of a link farm or redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious redirector infrastructure. This suggests the document is designed to drive traffic to potentially malicious sites, possibly for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=the+squat+challenge+free+pdf
    • http://files.faithconnectionsonmentalillness.org/uploads/1/3/0/9/130969386/zefisazepomime_vitutetodiba.pdf
    • http://files.michiganroofmasters.com/uploads/1/3/0/9/130969925/xipudumawalim.pdf
    • http://files.albanyhr.com/uploads/1/3/0/7/130776775/f141c442f0d2.pdf
    • http://files.vexsens.com/uploads/1/3/0/7/130775846/waforumuwanaxogudo.pdf
    • http://files.actingcoachlasvegas.com/uploads/1/3/2/6/132681566/lejele.pdf
    • http://files.icupearls.org/uploads/1/3/0/8/130874160/didozosumeba.pdf
    • http://files.educationmosaic.com/uploads/1/3/0/7/130739067/kudupujepizez.pdf
    • http://files.publichealthmuseum.org/uploads/1/3/1/3/131384789/a826b1b39.pdf
    • http://files.cityheritage.net/uploads/1/3/2/7/132740700/bobaladuwisamugeveka.pdf
    • http://files.cyclingadventures.net/uploads/1/3/2/6/132695689/sulexovabub_bubizelogu_mekodovi_pinuvawenun.pdf
    • http://files.graceub.com/uploads/1/3/2/6/132681404/6733747.pdf
    • http://files.ufly4fun.com/uploads/1/3/0/8/130813768/5f683b3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dupopopuf.files.wordpress.com/2020/06/90077010399.pdf
    • https://kibemiratet.files.wordpress.com/2020/07/xozixafugigezepixolumizaj.pdf
    • https://vavejesa.files.wordpress.com/2020/06/97407757092.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26965864763.pdf
    • https://cdn.shopify.com/s/files/1/0428/1240/7967/files/wewiwutomaxapomuzex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mujunevuduw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupenase.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/finonazi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23313492251.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dewefezagabujam.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006193.bin
1dc5f455a2c04e8f78cdd84d8dd786779855600a68a4986ada5b0ed6889cca1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6193 5216 bytes
font_01_sfnt_off00007339.bin
306156f428be23ea764d9a758209fb13414e62143632d56d8b32e5710ff45bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7339 10640 bytes

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