Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50bfa2d7bd5ff95…

MALICIOUS

PDF

44.6 KB Created: 2020-08-23 06:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8683c10a88802866ec34bdbffe28c21 SHA-1: d5302ef346c122094495821ebd8d44c0f5c2b766 SHA-256: e50bfa2d7bd5ff959533877f1669cfdb28eba95b6b9fdde933e93bd8bdfbab26
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=google+docs+pdf+filler'. This URL is presented within the document body, suggesting a social engineering lure to trick users into clicking it. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirector.

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=google+docs+pdf+filler
    • http://seriwe.huffmansflowersofthefield.com/uploads/1/3/0/7/130739892/jopegutoro.pdf
    • http://wigef.evelineverhulst.nl/uploads/1/3/1/3/131383483/mozolovuxaki.pdf
    • http://files.nkphillipscpa.com/uploads/1/3/1/1/131164125/rebewodale.pdf
    • http://xutukija.eternalbouquets.com.au/uploads/1/3/2/6/132680903/8803839.pdf
    • https://cdn.shopify.com/s/files/1/0428/4809/2323/files/inductive_load_and_capacitive_load.pdf
    • https://cdn.shopify.com/s/files/1/0440/4455/0294/files/hdfc_mutual_fund_schemes_2018.pdf
    • https://cdn.shopify.com/s/files/1/0435/8946/8328/files/xalajukame.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/byju_s_mod_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9390/files/65935084197.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/nemanonurogemeget.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/love_birds_movie_tamil_songs.pdf
    • https://cdn.shopify.com/s/files/1/0434/2346/5623/files/sikagamifanogadatu.pdf
    • https://cdn.shopify.com/s/files/1/0447/8110/9405/files/10551129491.pdf
    • https://cdn.shopify.com/s/files/1/0434/3916/1500/files/quality_assurance_management_system.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_off00005b30.bin
68f2c4b2e06f5252f122f3d615af94afb74937d27b5dfcc11834c5d7278efa58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B30 5144 bytes
font_01_sfnt_off00006ccc.bin
58845e068ee3d3f1b86b51e73c6533e2c930f90eb0e46c1ad582128bc0e98938		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CCC 10456 bytes
font_02_sfnt_off000090c1.bin
54c892f67831590c69ab92c82b7312351b88eb463502434cc715443974eba8ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90C1 16088 bytes

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