Malicious PDF — malware analysis report

Static analysis result for SHA-256 855e9a19bd0d8985…

MALICIOUS

PDF

45.3 KB Created: 2020-08-04 01:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4014744e2e3cd0fa0fcb1db0c1fe25b SHA-1: 580ea0d10d25bfbc6d5abc6a5ca6a8ea99c77ad9 SHA-256: 855e9a19bd0d8985ac1cec45d69e1ec4855e71b7ba3e39d95689186f77fb9ca6
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that appears to be part of a link farm designed for SEO manipulation. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous external links, many hosted on Shopify, further supports the link farm hypothesis. The ML classifier also strongly indicated maliciousness.

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=oxford+physical+science+grade+10+textbook+pdf+download
    • http://files.musicalkitestring.com/uploads/1/3/0/8/130873943/bosowox-motore-tuzalukuduz-wogem.pdf
    • http://files.inconspicuoushipster.com/uploads/1/3/1/8/131871852/jimekewarimon.pdf
    • https://cdn.shopify.com/s/files/1/0432/8059/7152/files/papijilafebogagebubunubu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/22294429494.pdf
    • https://cdn.shopify.com/s/files/1/0436/8531/4715/files/corpsebloom_risk_of_rain_2.pdf
    • http://files.pec.us.com/uploads/1/3/0/7/130775458/wuvasovomedidux-kemip-bivenebosa-ripilobadokomo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9651/files/microeconomics_hubbard_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94215193789.pdf
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/newokirugixuru.pdf
    • https://cdn.shopify.com/s/files/1/0439/7678/6078/files/62287738940.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/zazizuguzetomosenam.pdf
    • https://cdn.shopify.com/s/files/1/0435/5011/3943/files/centripetal_force_lab.pdf
    • https://cdn.shopify.com/s/files/1/0438/2916/6242/files/shook_me_all_night_long_tablature.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/mosanijan.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_off000063c4.bin
ce05f36e40ff46ad75697d110202f55c66178ec2e413b7caea7c50fe07cce7b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C4 5892 bytes
font_01_sfnt_off000077ea.bin
0ebab8fcc8d881e1e9a8b7364d9f3f1873decb262681bf75041c7f98a12f4a92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77EA 9980 bytes
font_02_sfnt_off00009a25.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A25 4324 bytes

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