Malicious PDF — malware analysis report

Static analysis result for SHA-256 710b4f4caf88a0f9…

MALICIOUS

PDF

45.2 KB Created: 2020-08-27 14:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da46527d69161f85630ea84206ae9631 SHA-1: 3fa27b28aae27a637c1a2e52967353fb3c65ab9d SHA-256: 710b4f4caf88a0f934fc208e9e36d8942a6006bdd2ad205136ef60930a5d6731
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to suspicious or unknown domains, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF files hosted on various domains, reinforcing the idea of a lure to external content. No scripts were extracted from this sample.

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=stephen+covey+books+sold
    • http://files.engagingnh.org/uploads/1/3/1/1/131164236/71375.pdf
    • http://babufewuk.highmarkcompanies.com/uploads/1/3/2/7/132740214/zosakujomamajaxada.pdf
    • http://files.kissingdogdesigns.com/uploads/1/3/0/9/130969632/fecdc48ba395.pdf
    • http://defoki.shalomfoodpantry.org/uploads/1/3/1/0/131070588/7643157.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5756/9189/files/fafotovifapowakivagegudo.pdf
    • https://cdn.shopify.com/s/files/1/0440/4989/1478/files/usar_el_cerebro.pdf
    • https://cdn.shopify.com/s/files/1/0438/0465/5773/files/rufedunadag.pdf
    • https://cdn.shopify.com/s/files/1/0439/1682/0635/files/96433981063.pdf
    • https://cdn.shopify.com/s/files/1/0430/6357/4682/files/termux_bitcoin_mining.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/26803984628.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/89179290486.pdf
    • https://cdn.shopify.com/s/files/1/0438/0839/1330/files/activex_free_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0434/2661/1356/files/ansys_cfd_post.pdf
    • https://cdn.shopify.com/s/files/1/0437/6661/2130/files/2666197414.pdf
    • https://cdn.shopify.com/s/files/1/0436/8770/6777/files/kaspersky_antivirus_free_activation_code.pdf
    • https://cdn.shopify.com/s/files/1/0433/0255/1716/files/vuzopu.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_off0000739a.bin
e067823c76a7ccf609a5f7f90d25ea74326f493fb9529259bfd6840e3eb1e81b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739A 5324 bytes
font_01_sfnt_off000085b6.bin
4b61f4c974f93c8bdff2cf2f94441522fe52706facbc22c98c8164aa1de28520		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85B6 10160 bytes

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