Malicious PDF — malware analysis report

Static analysis result for SHA-256 0008649545f724d7…

MALICIOUS

PDF

46.7 KB Created: 2020-08-25 11:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82d5f1e03b727ddd59bcddca61e2f871 SHA-1: 6f68b6e5ae4550f4edd70f3f881339782e5986bb SHA-256: 0008649545f724d754485d8d28a1417d9cfe98bf128f2165109ddd775d0de2f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to 'Cambridge IELTS 9 listening test 3 answers'. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=cambridge+ielts+9+listening+test+3+answers
    • http://files.natalieberry.net/uploads/1/3/0/7/130775063/0426ee02a314.pdf
    • http://files.stressfreefurniture.co.nz/uploads/1/3/0/9/130968921/velikewuzad.pdf
    • http://tapemek.harrisonkitteridge.com/uploads/1/3/1/3/131380467/78298.pdf
    • http://wexokeju.samniquekahalsey.com/uploads/1/3/1/3/131383791/782125.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0450/2241/2958/files/equilibrium_economics.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/guwesimutetalajizobanubel.pdf
    • https://cdn.shopify.com/s/files/1/0454/6310/9790/files/salary_slip_template_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0432/5058/1662/files/vazufuxogoxomidoliliwoti.pdf
    • https://cdn.shopify.com/s/files/1/0448/1482/7677/files/tavanumawumon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38804475130.pdf
    • https://cdn.shopify.com/s/files/1/0431/3602/4742/files/31347849371.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/kawadipi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6178/files/plexiform_neurofibromas_in_nf1.pdf
    • https://cdn.shopify.com/s/files/1/0428/1237/5207/files/xunobivimosesiromoku.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/xiluzemosa.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/los_factores_bioticos_y_abioticos.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005560.bin
5a968c14ec1e6260df7c4f6b52c29cb33281a143ba4f2301a6b564b3fcc24d80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5560 5400 bytes
font_01_sfnt_off000067a7.bin
ef517f40f878cc0f3d9ed64cf666cbedc110ada223c5f6c0c61129d832337df7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A7 10224 bytes
font_02_sfnt_off00008ab2.bin
5d72d630640305d452d914085fd6c65e0d8125198bed8028c282d44fd0327be8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB2 16068 bytes
font_03_sfnt_off00009f57.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F57 4324 bytes

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