Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d1506d01936bdb…

MALICIOUS

PDF

45.2 KB Created: 2020-07-30 17:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd57b77dd655a0770663500a5e3bff1f SHA-1: 2ca69407961c085f6724c0985b02ee6b8a65ae53 SHA-256: 15d1506d01936bdba2ea40c5de8ba8399285eb9e80c26f750408080efbad52d1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious URL identified is 'https://ttraff.com/pify?keyword=acheulean+industry+pdf', which is flagged as a redirector to malicious infrastructure. While no scripts were extracted, the presence of numerous links and the ML classifier's high confidence suggest a malicious intent, likely to lure users to external sites for further compromise or phishing. The document body is heavily obfuscated and unreadable.

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.com/pify?keyword=acheulean+industry+pdf
    • http://files.hullabaloomusicfestival.com/uploads/1/3/2/7/132740415/zikomigop.pdf
    • http://files.writespacejerusalem.com/uploads/1/3/1/3/131379828/a094f57ee6.pdf
    • http://files.downtownblonde.com/uploads/1/3/1/4/131482915/dekirobevexepi.pdf
    • http://files.claytonyouththeater.com/uploads/1/3/2/6/132683001/6484233.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20116177671.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/88455853387.pdf
    • https://cdn.shopify.com/s/files/1/0433/1080/9256/files/noruwipudikiku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sopituwoxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5251/4971/files/lewovuganunokutoxixunape.pdf
    • https://cdn.shopify.com/s/files/1/0428/5415/4406/files/20433633831.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8521/files/wejatarudozo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3876/7264/files/vewiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8890/files/41270274795.pdf
    • https://cdn.shopify.com/s/files/1/0433/6032/1691/files/gokenaloxotarepifewuzivij.pdf
    • https://cdn.shopify.com/s/files/1/0438/4430/5046/files/ronilirojonivu.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_off00007313.bin
bdea41b9ddda34b7ffb76495de6c611ae752fe04e8d022b052f6b489beda1040		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7313 5108 bytes
font_01_sfnt_off00008464.bin
7f51dda7d1be8196b14892c25fda5fb31b260f3f32d178f66a9b49c8809d4fb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8464 10428 bytes

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