Malicious PDF — malware analysis report

Static analysis result for SHA-256 188f9d2deb82de01…

MALICIOUS

PDF

46.7 KB Created: 2020-08-19 11:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bd600522426d3e01132b9db7425e0f1 SHA-1: cd3cec3698ceef890e0f8ed49fadefed71eacd47 SHA-256: 188f9d2deb82de01e6c485798c9f255024e980340b3ab54e6a8ba796edb2f99d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.com/pify?keyword=bejeweled+blitz+unlimited+coins+apk`. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a link farm or redirection scheme. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern is likely a lure to a malicious site, potentially for credential harvesting or malware distribution.

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.com/pify?keyword=bejeweled+blitz+unlimited+coins+apk
    • http://sifafanoz.shopasbonline.com/uploads/1/3/1/0/131070420/f7d0a5.pdf
    • http://palur.millerptorlando.com/uploads/1/3/1/4/131482826/towut.pdf
    • http://files.clearfieldarts.org/uploads/1/3/2/6/132695575/galofuvifevoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0595/9588/files/37299130191.pdf
    • https://cdn.shopify.com/s/files/1/0435/4169/2580/files/punobesigutadugoxevigi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6150/files/pevesujap.pdf
    • https://cdn.shopify.com/s/files/1/0429/9699/0105/files/95288459514.pdf
    • https://cdn.shopify.com/s/files/1/0434/7848/3096/files/financial_accounting_question_paper_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/34476831299.pdf
    • https://cdn.shopify.com/s/files/1/0434/1425/7820/files/1075909121.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2687/files/bivugoxove.pdf
    • https://cdn.shopify.com/s/files/1/0428/1607/7991/files/gejerojopekam.pdf
    • https://cdn.shopify.com/s/files/1/0437/7663/9127/files/dafizurapeseli.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006226.bin
c1c24bc58d21de8743c3acb957147e1a24ebb1568ccce15bccf3f20d0ccff7f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6226 5596 bytes
font_01_sfnt_off0000753a.bin
0345805e5ac72f9a1575ae830e002a77776e5cee862c44b104cd628b8332a43c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753A 10324 bytes
font_02_sfnt_off000098e6.bin
9ffc405fbed68b1ed35cf25504b2a045b5802e2074cf99e6920a228075e829fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98E6 16160 bytes

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