Malicious PDF — malware analysis report

Static analysis result for SHA-256 610db16bef26fc9f…

MALICIOUS

PDF

35.4 KB Created: 2020-08-31 01:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa42d491ccd1169b4bc9d9d088704c6d SHA-1: 99bc16589761bdb401d6c5977ef28744c704a013 SHA-256: 610db16bef26fc9f090c62a9561293e68e972647c82cbe6797e2eec94f23e47b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a PDF link farm. The primary malicious URL, 'https://ttraff.cc/wix?keyword=b1+grammar+topics', is flagged as a known malicious redirector. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lure the user to malicious content, likely for phishing or malware delivery.

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/wix?keyword=b1+grammar+topics
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/12dc78_2d3947549a1d457daa93a0ca57f53808.pdf
    • https://static.usrfiles.com/ugd/cac9e4_22ca4fb1ebe74709adfb008be39d99d4.pdf
    • https://static.usrfiles.com/ugd/3bca44_5114118652e5429e96fcf1369c060cc3.pdf
    • https://static.usrfiles.com/ugd/d01287_9bc4896686a048e793d99d09ec368256.pdf
    • https://static.usrfiles.com/ugd/5ecadc_0e5d99c7953e407bb52a53ebb3ee3adb.pdf
    • https://static.usrfiles.com/ugd/bd5c68_30d14bc161c64caf8f8a09e3753bb67d.pdf
    • https://static.usrfiles.com/ugd/6846fe_3ca0a919d2d04f22ba5f66bc7ae9d602.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_c8626eedb5f4408690291bb3c2015c03.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44994208471.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/palafasejuzanuz.pdf
    • https://cdn.shopify.com/s/files/1/0459/9401/6935/files/kawasaki_ninja_power_wheels.pdf
    • https://cdn.shopify.com/s/files/1/0429/7850/8953/files/fisajelupo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0667/3574/files/31548361082.pdf
    • https://cdn.shopify.com/s/files/1/0428/9272/2339/files/comment_avouer_ses_sentiments__une_fille.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84113106953.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/talewozimuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/7761/5270/files/nukusitabemewuxad.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_off00004d46.bin
de9ab9dc5921fd51b53802502654340d9add9fa31fd2b9307d8b0b8d183f9bad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D46 5324 bytes
font_01_sfnt_off00005f4f.bin
8dbc26326a93c39e4a237cb3fb39dd68c84aae8b5ed87e8574af2f2e5902538c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4F 9836 bytes

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