Malicious PDF — malware analysis report

Static analysis result for SHA-256 1157cb424eddc3c6…

MALICIOUS

PDF

34.6 KB Created: 2020-08-04 19:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2709809addc8bc13d866c96b28b84397 SHA-1: 8498524c18dbc695f3f8aa7e3438e58da1390403 SHA-256: 1157cb424eddc3c6a3ba7a149257d7903ad15f3d59338a531fd62d9fcf771f8b
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'publication' and includes the malicious URL. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm or SEO spamming attempt, with the primary redirector likely serving as the entry point for further malicious activity.

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=publication+17+2020+pdf
    • http://files.volgagermansportland.info/uploads/1/3/0/7/130738484/b7d9becfc16.pdf
    • http://files.haymountrehab.com/uploads/1/3/1/4/131406849/ligitikitimanir-buxivu.pdf
    • http://files.oneworldcircus.com/uploads/1/3/1/0/131071209/mabewef-sopegevoxo.pdf
    • http://files.ilehc.org/uploads/1/3/1/1/131163712/wosotaxasu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0531/2156/files/lamuwavusujekeripeka.pdf
    • https://cdn.shopify.com/s/files/1/0435/7901/5327/files/cfa_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/45719155964.pdf
    • https://cdn.shopify.com/s/files/1/0435/6158/2755/files/koduwewufiluwid.pdf
    • https://cdn.shopify.com/s/files/1/0428/7981/1750/files/mewalenumupopimedegakiti.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/19441962170.pdf
    • https://cdn.shopify.com/s/files/1/0433/2873/3352/files/nidesopemotufekukiwoneso.pdf
    • https://cdn.shopify.com/s/files/1/0435/6128/7839/files/71139359881.pdf
    • https://cdn.shopify.com/s/files/1/0436/9265/4745/files/75726309665.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/fexafinixijajadug.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1070/files/libupo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3394/2423/files/fowenalaredo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9331/9079/files/wuwimedojawibegajuluzix.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4705/files/mosadirujekufatuwi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049ec.bin
8ac09f4fbaaea1c945dbfffdf46e3cfc89c2e9af875a5be608ce2e60cb68b3d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49EC 5420 bytes
font_01_sfnt_off00005c7d.bin
5752d2f023ed5d8c68cc2aa17e80ae707b2955e12f5d55f29ae25476c66d483f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7D 9704 bytes

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