Malicious PDF — malware analysis report

Static analysis result for SHA-256 634576b97163884e…

MALICIOUS

PDF

45.5 KB Created: 2020-08-14 08:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50da8e7b4fbe39acdcbd0b0c500a722c SHA-1: a26e10217b65c9cb12839cd1bbee1a1b254caca5 SHA-256: 634576b97163884ed2b5f8dd930898c950d029e21d1f201ca8a5decf352a9629
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF filenames, suggesting a lure. The ML classifier also strongly flagged this PDF as malicious.

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=haute+route+guided+ski
    • http://files.birichinokids.com.au/uploads/1/3/0/7/130739404/5496613.pdf
    • http://files.barbakoffdesign.com/uploads/1/3/0/9/130969992/vivebasawibiwop.pdf
    • http://files.londonpoetryopenmic.com/uploads/1/3/0/7/130738778/b68664ccbdb72c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/4533/6726/files/dizuto.pdf
    • https://cdn.shopify.com/s/files/1/0437/6199/1841/files/46125021580.pdf
    • https://cdn.shopify.com/s/files/1/0434/4971/2806/files/runolot.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3429/files/barajakelijes.pdf
    • https://cdn.shopify.com/s/files/1/0432/0804/8808/files/76252470913.pdf
    • https://cdn.shopify.com/s/files/1/0444/0725/9302/files/understanding_computers_today_and_tomorrow_15th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/jidagakesuze.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1611/files/relative_clauses_exercises_1_bachillerato.pdf
    • https://cdn.shopify.com/s/files/1/0436/8770/6777/files/99097643438.pdf
    • https://cdn.shopify.com/s/files/1/0433/1572/4456/files/86909075978.pdf
    • https://cdn.shopify.com/s/files/1/0432/7361/7568/files/muguzekibopajefepexokidox.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1611/files/lozurawuwesobixejo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3755/files/69518844174.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006933.bin
0b5605b5e0b6d727949e64a0887c30ca3ec91bc8396e12907c707f61d5d866ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6933 4764 bytes
font_01_sfnt_off00007977.bin
ab95723c6fe4cf103a142ed084eb7cb8faa1b11a61aff661c8a2182ad5b641c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7977 9752 bytes
font_02_sfnt_off00009adf.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ADF 4324 bytes

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