Malicious PDF — malware analysis report

Static analysis result for SHA-256 179a06e99389a581…

MALICIOUS

PDF

36.7 KB Created: 2020-08-12 06:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 528a4198a51138fae6e1ae10e0cab845 SHA-1: 4652ef2e1abe51fd8e063313ea62790a3905635c SHA-256: 179a06e99389a581c9012986277326a328606ff93e0d6cc8fbf2978bce66c1eb
174 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious redirectors or link farms. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains a URL that is also listed as a malicious redirector. This suggests the document is designed to lead users to malicious websites, likely for phishing or malware distribution.

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.com/wb?keyword=aerophone%20mini%20manual
    • http://files.tungstenfishingweights.com/uploads/1/3/0/7/130776264/7659154.pdf
    • http://nibopalug.jorn.com/uploads/1/3/1/3/131379510/tobiviw.pdf
    • http://files.taradaav.com/uploads/1/3/2/6/132681560/176288.pdf
    • http://wepamet.rchsproductions.org/uploads/1/3/1/0/131070767/wifar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6181/9045/files/medical_biochemistry_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8117/files/66527492489.pdf
    • https://cdn.shopify.com/s/files/1/0432/1758/4283/files/sewuteke.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84602765162.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18187133080.pdf
    • https://cdn.shopify.com/s/files/1/0428/1230/9671/files/edamame_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/bankers_adda_english_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0523/8692/files/23568949941.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/lesezuzodilojek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/metegemekipezafekude.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3450/files/pugaxeledarubelaxejiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/10359466521.pdf
    • https://cdn.shopify.com/s/files/1/0436/2108/9444/files/alphabetical_list_of_chemical_elements.pdf
    • https://cdn.shopify.com/s/files/1/0435/8511/0177/files/58214302200.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_off000051ea.bin
bd2a1f68da9c001ffaddc5863e229c1710c7d0a227f42450c1389e57cb0d2d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51EA 4872 bytes
font_01_sfnt_off00006243.bin
b912892c3ca809fbb2caa3b429b334c1ba271870476b49a298850d9a7ea07a03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6243 10484 bytes

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