Malicious PDF — malware analysis report

Static analysis result for SHA-256 12cfb3e3f62757c7…

MALICIOUS

PDF

52.9 KB Created: 2020-08-07 15:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a119a6df667f69868318410cc2b888b4 SHA-1: f7a5abd37a5d528cf957b9efb7bbcede65cfd76b SHA-256: 12cfb3e3f62757c77ba287fe06f02f6e7d1488f2ccf72f963a74b2c179b43b63
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a redirector to malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, suggesting a coordinated effort to direct users to potentially harmful content. The presence of multiple Shopify links, some marked as benign, may be an attempt to blend in with legitimate content.

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=cambios+sociales+del+envejecimiento+pdf
    • http://files.kwongwingkwan.com/uploads/1/3/0/9/130969500/3739562.pdf
    • http://kumitazek.chtechlab.com/uploads/1/3/0/7/130775934/sanekukoz-vuwopopejen-pefum-beveler.pdf
    • http://files.msckylesportsforspecialneeds.com/uploads/1/3/0/7/130776592/latasimetubatexasomi.pdf
    • http://files.lisa--hall.co.uk/uploads/1/3/2/7/132710700/9a26a0b198ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/kugenefasirag.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3370/files/64553507936.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/41852342689.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/6175142965.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/describe_sociology_as_a_science.pdf
    • https://cdn.shopify.com/s/files/1/0428/3059/4204/files/donakotesezovijegimedole.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/31432751537.pdf
    • https://cdn.shopify.com/s/files/1/0430/6527/8625/files/neragatamifeginizejowika.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/faxalesekedasawa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7207/files/86223556529.pdf
    • https://cdn.shopify.com/s/files/1/0438/1959/7981/files/type_of_network_topology.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/vomugedon.pdf
    • https://cdn.shopify.com/s/files/1/0435/6092/7393/files/equilibrio_acido_base_veterinaria.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/wujejifuvesenubu.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_off00008ef3.bin
383cab1e8434cb2be931e2ced962821f08a9c4369bf7051b1e1ee70c2dc9c718		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF3 5388 bytes
font_01_sfnt_off0000a137.bin
d7aa604e25063dbf27428fa5b9a409f74ceeecfbd44a3552c3edecc790ef4f6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA137 11456 bytes

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