Malicious PDF — malware analysis report

Static analysis result for SHA-256 8787f216f7ef535c…

MALICIOUS

PDF

41.6 KB Created: 2020-08-06 22:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22c40716d07e6296df36ea2d2c90bfaa SHA-1: 6e3ce54d614c4ae407c7ead4c4782c317667376a SHA-256: 8787f216f7ef535cd14733498211107046a994d3c2163094bafab4a2a8469b00
174 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. The presence of a link farm and a callback lure heuristic further suggests a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.ru/pify?keyword=the+beginner+s+book+of+salah+by+ghulam+sarwar+pdf
    • http://files.northlandrentalhomes.com/uploads/1/3/0/7/130776626/4fa9d6c.pdf
    • http://files.ssyyogalife.org/uploads/1/3/0/7/130775429/mekoguremozudefat.pdf
    • http://files.palsjamaica.org/uploads/1/3/2/7/132710748/c315858d3b.pdf
    • http://files.theclassicequestrianllc.com/uploads/1/3/1/4/131437733/lawalipituwi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/fundamentals_of_aerodynamics_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jotinu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3280/5527/files/58324089204.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/kesanajuridotokotixu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94323725826.pdf
    • https://cdn.shopify.com/s/files/1/0437/6189/3534/files/1045597098.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/gabesigaxan.pdf
    • https://cdn.shopify.com/s/files/1/0437/8794/4094/files/35952628341.pdf
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/65905600296.pdf
    • https://cdn.shopify.com/s/files/1/0434/1219/3438/files/zen_mind_beginner_s_mind_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7335/5424/files/nuketown_code_for_black_ops_3.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/jupat.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1294/files/37447942180.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_off0000604d.bin
a333a40fecc11a26bbae53f0a7f8e92905cbdbe33650a483d071d111b4fdcc60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604D 5804 bytes
font_01_sfnt_off000073f7.bin
62ae687d5c087ff9bfd524117006ad0fe529805af76ccf714a53f379e2724207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F7 11096 bytes

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