Malicious PDF — malware analysis report

Static analysis result for SHA-256 0441c5e6618d0c3a…

MALICIOUS

PDF

37.3 KB Created: 2020-08-22 03:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a9ba23c37300a5cf964a0c37771c49f SHA-1: f43662ddd57a314dfd9000ddce529387851d1d27 SHA-256: 0441c5e6618d0c3aeff0f8abc24c759bb3c839a2b898d5c108ea25faccd4436b
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, suggesting a link farm or SEO poisoning attack. The document body, though heavily obfuscated, contains text related to 'everyday science mcqs with answers' and the malicious URL, indicating a lure to a potentially malicious site. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=everyday+science+mcqs+with+answers
    • http://files.northwindorganicfarm.org/uploads/1/3/1/3/131398487/vadixa.pdf
    • http://files.janaemarks.com/uploads/1/3/2/7/132740204/2713275.pdf
    • http://files.jeffreytkendigpc.com/uploads/1/3/0/7/130739924/2297880.pdf
    • http://nefiniri.jeremyseal.com/uploads/1/3/2/3/132303064/jiwovezeridine_sibaz_suxog_temoret.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7750/1079/files/classicismo_literatura.pdf
    • https://cdn.shopify.com/s/files/1/0435/3572/8794/files/calligraphy_letters_fonts_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/4274/3207/files/kufakifobabine.pdf
    • https://cdn.shopify.com/s/files/1/0437/2224/4264/files/40496868205.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/33776321946.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/37629755229.pdf
    • https://cdn.shopify.com/s/files/1/0429/3869/5846/files/kenmore_elite_73153.pdf
    • https://cdn.shopify.com/s/files/1/0433/9469/5329/files/adfg_sport_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/bunepomep.pdf
    • https://cdn.shopify.com/s/files/1/0439/0433/6027/files/kipafo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5470/1463/files/basic_computer_skills_in_telugu.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_off00005137.bin
cde29661558d1b31bc72863d38e50b9fcaddf656339fee8bc640545eade165bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5137 5484 bytes
font_01_sfnt_off000063ce.bin
cbf8b9bd11fa7011887a765183d4a3e36cecdd0b3d2b16ba400880d405786ccd
pdf-font-stream PDF embedded font (sfnt) at offset 0x63CE 10348 bytes