Malicious PDF — malware analysis report

Static analysis result for SHA-256 7073f7b222a4de20…

MALICIOUS

PDF

49.2 KB Created: 2020-08-24 22:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cf440c5986ba9d71cb85afde8af5ab4 SHA-1: 0f6b0cadbd1f879bd034da20f07ec94f24a1fec2 SHA-256: 7073f7b222a4de2006f77bf38be536e21eaae9043b65db2ab53d88f271cb8e7d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a critical redirector link to traff.com, suggesting a phishing or malware distribution attempt. The document body, though obfuscated, contains text related to a 'worksheet' and the malicious URL, indicating a lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector and link farm.

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=finding+perimeter+of+a+triangle+worksheet
    • http://files.bugoutweepholes.com/uploads/1/3/1/4/131406269/171782.pdf
    • http://fizodut.carolinebreck.com/uploads/1/3/0/8/130815017/vobonedakovad-denobu-budujovunifilu.pdf
    • http://files.androidtvperth.com/uploads/1/3/1/4/131438397/vepow-fuwoside-fusevaxedewagi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/1442/2677/files/netuvenive.pdf
    • https://cdn.shopify.com/s/files/1/0437/6359/7466/files/soraxoxisat.pdf
    • https://cdn.shopify.com/s/files/1/0439/1151/2232/files/90847770790.pdf
    • https://cdn.shopify.com/s/files/1/0429/6297/6921/files/castellano_o_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0436/2744/6435/files/wezufelanevajosuveko.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4688/files/85053082226.pdf
    • https://cdn.shopify.com/s/files/1/0449/3407/0440/files/topology_optimization_approaches_a_comparative_review.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1563/files/18913039682.pdf
    • https://cdn.shopify.com/s/files/1/0437/2358/7736/files/70553443858.pdf
    • https://cdn.shopify.com/s/files/1/0434/1612/5590/files/83567922850.pdf
    • https://cdn.shopify.com/s/files/1/0430/1222/7225/files/rukerululujaboxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/information_report_template_grade_3.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lipowu.pdf
    • https://cdn.shopify.com/s/files/1/0450/4364/6614/files/st_athanasius_on_the_incarnation.pdf
    • https://cdn.shopify.com/s/files/1/0460/8701/2516/files/aarakshan_bollywood_movie_free.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_off00005f7a.bin
e8e6a4d6d4cf3005fe3aca0c558ebd9761d5fd2c1eefbe17b7336d392fb00d46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7A 5356 bytes
font_01_sfnt_off0000718e.bin
7435b00be563e4434c20d57b4f6cf9d0ee9213fcd020110ff03496cae6caa03a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x718E 9984 bytes
font_02_sfnt_off000093de.bin
d12ffaa940c15d24e471729ee5567d21a88133c29a2466b1fcf75c36d091922f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93DE 16196 bytes
font_03_sfnt_off0000a909.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA909 4324 bytes

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