Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec5cb881cc88577…

MALICIOUS

PDF

55.6 KB Created: 2020-08-20 21:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81126a7f9b947fcbb0fc82bf868d6716 SHA-1: 9faf9a70e61bfe67ad89bf455a84059f78a56830 SHA-256: 7ec5cb881cc8857733ef7bb8f786cc2698ed79c40a6df8cc4f43860cc8654738
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to 'Whatsapp maths puzzles'. The presence of a malicious redirector and a large number of external links indicates an attempt to lead users to potentially harmful content, likely for phishing or malware distribution.

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=whatsapp+maths+puzzles+with+answers+in+marathi
    • http://fuxod.cassadagabrighidswell.org/uploads/1/3/1/8/131856746/guxojer-derawulina-duvigusaba.pdf
    • http://modesasu.vbmdallas.com/uploads/1/3/0/8/130813055/xinuvi-bibekoxuw-vaxafilo.pdf
    • http://jumukop.australian-spirit.com/uploads/1/3/1/6/131606289/3303195.pdf
    • http://files.bayareajunkhauling.com/uploads/1/3/1/3/131398386/1359e80d82ef.pdf
    • http://files.taylorgaunt.co.uk/uploads/1/3/0/7/130776111/d6f70d64a66cf47.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/6071/4904/files/52672252808.pdf
    • https://cdn.shopify.com/s/files/1/0427/4742/9031/files/7th_edition_tau_codex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72163988246.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89377355024.pdf
    • https://cdn.shopify.com/s/files/1/0431/0299/4586/files/feleb.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/lilepopedino.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/pewalufuxafepena.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/zakunumovagodema.pdf
    • https://cdn.shopify.com/s/files/1/0427/3097/9495/files/96714135787.pdf
    • https://cdn.shopify.com/s/files/1/0435/8779/7160/files/65567684248.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f7d.bin
73828e6999b98555675f4844c041693f665aa5a57537bbc43d2337fdf201bb5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7D 6692 bytes
font_01_sfnt_off0000703e.bin
f5a651677c87ec99624d692201c9d54e62c8dd968b533d0f969513eaac1e8a55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x703E 5212 bytes
font_02_sfnt_off000081f1.bin
49d4aa48b47816a13bf52481e96f5efeb01733c8eba2b8d1fdb179c85539f005		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F1 10636 bytes
font_03_sfnt_off0000a634.bin
3a7aa91331fec2189d4f14903ed06b7aed731572acea9868356fb397bdd613a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA634 16444 bytes
font_04_sfnt_off0000bc65.bin
6007b68f102d97851c80126d0c8e1f6b6aac081fa73c6082af46e76b5534b1d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC65 5416 bytes

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