Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b95f9b876725fa…

MALICIOUS

PDF

49.1 KB Created: 2020-08-10 05:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5377ecddaeb7eaddc383fe54de1b8f8 SHA-1: a71d9678f5af8c99f555b156a328cb2c8e75a988 SHA-256: 97b95f9b876725faccf17b791642a9f497815dd0d2f4b21e2c855caa52bb91ec
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a link farm with numerous external PDF links. One of these links, 'https://ttraff.ru/pify?keyword=solutions+to+climate+change+pdf', points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of a link farm and a malicious redirector indicates an attempt to lure users to malicious sites.

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=solutions+to+climate+change+pdf
    • http://files.techbrain123.com/uploads/1/3/0/8/130814397/nudefupova.pdf
    • http://files.thestockmansbreakfast.com/uploads/1/3/1/8/131856119/wexifufagofikoxiko.pdf
    • http://files.csroyalty.com/uploads/1/3/1/3/131378953/xipojagazere-vikitimafawitu-jedeboneba.pdf
    • http://files.eaglecreeklavender.com/uploads/1/3/1/3/131398250/lopojurani-bikani-donugobujurulot-kugozetuxazal.pdf
    • https://cdn.shopify.com/s/files/1/0441/0979/1384/files/nujakojigijebapakise.pdf
    • https://cdn.shopify.com/s/files/1/0433/7264/2460/files/classifying_triangles_game.pdf
    • https://cdn.shopify.com/s/files/1/0438/9391/5800/files/dufugirawidoxute.pdf
    • https://cdn.shopify.com/s/files/1/0429/9060/0355/files/bopineg.pdf
    • https://cdn.shopify.com/s/files/1/0435/2930/6263/files/bovebuxadagoninifonolud.pdf
    • https://cdn.shopify.com/s/files/1/0429/0671/4268/files/watogipub.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/60433615942.pdf
    • https://cdn.shopify.com/s/files/1/0430/8995/2922/files/zonozebapuditenonami.pdf
    • https://cdn.shopify.com/s/files/1/0428/6529/5526/files/tujazuxuvikowedovutasez.pdf
    • https://cdn.shopify.com/s/files/1/0432/0326/4667/files/30895615488.pdf
    • https://cdn.shopify.com/s/files/1/0434/0993/2440/files/94564473342.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/fusoxujulixubatu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7179/8436/files/taxawuzarogu.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072db.bin
82ec8a512428bbabc00144e263936ded75125ba5fa97d7184f76ed64e8759f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DB 5456 bytes
font_01_sfnt_off00008534.bin
81a66775e690deda802759ce2d419b31d8234769e5f34cd69b2a4fd5554c9373		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8534 10548 bytes
font_02_sfnt_off0000a929.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA929 4324 bytes

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