Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f8689a31e086dc…

MALICIOUS

PDF

51.6 KB Created: 2020-08-10 01:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c372dfb6cf72a5549ffca4982ef1e785 SHA-1: 7447a45fe4744b6ba53eab5549b31e3193e9ca14 SHA-256: 74f8689a31e086dcb6fd028555e95c9f3035bec38bcc35d3a67914c79fb2aa69
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'adaptive immunity' and includes the malicious URL. The presence of a large number of external links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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.ru/pify?keyword=adaptive+immunity+pdf
    • http://binamofuv.engageinspireexpectinform.com/uploads/1/3/1/3/131381679/fedanidumewo.pdf
    • http://files.corpuschristiquilters.com/uploads/1/3/2/6/132682040/naravagamuwo.pdf
    • http://files.muusan.org/uploads/1/3/1/1/131163667/ee82b3ff.pdf
    • http://files.stephvenerus.com/uploads/1/3/1/8/131872054/tutuxejadu_mobokimolofu_bowosonesivu.pdf
    • http://files.luvtheview.com/uploads/1/3/1/4/131406861/rugobena.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/total_gym_workout_routine.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3277/files/writing_argumentative_essays_nancy_wood.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6378/files/articulation_and_phonological_disorders_bernthal.pdf
    • https://cdn.shopify.com/s/files/1/0432/8400/5032/files/novut.pdf
    • https://cdn.shopify.com/s/files/1/0437/0877/6599/files/16022346491.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/95824059900.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8402/files/mapudosogug.pdf
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/redepunonesomon.pdf
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/45268040802.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/amisom_mandate.pdf
    • https://cdn.shopify.com/s/files/1/0444/3042/6278/files/sap_basis_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/alliance_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/2624/9885/files/4700536113.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fe9.bin
8024b1173d5ad1d6c5d6d5d624a202e438725689cafcc57805482d0b5dbee747		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE9 4804 bytes
font_01_sfnt_off0000903c.bin
eb45fc54b76e771e98e95f1cdefb02e3d8262bf5ef4c47640491d028e1473475		 pdf-font-stream PDF embedded font (sfnt) at offset 0x903C 10228 bytes
font_02_sfnt_off0000b325.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB325 4324 bytes

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