Malicious PDF — malware analysis report

Static analysis result for SHA-256 8850cd87e5899200…

MALICIOUS

PDF

49.7 KB Created: 2020-08-21 22:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35308194dc52127c85e9780a20643a28 SHA-1: e3bb4b522190ffb451656bd8aab9cc5c3e8f0b6a SHA-256: 8850cd87e5899200b40605efde34a3be8780cbe460a57398a14f0ce63b652a39
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a redirector to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests an attempt to direct users to potentially harmful content. The document body, though partially obfuscated, contains a URL that mirrors the malicious redirector, reinforcing the attack pattern.

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=batman+arkham+knight+pc++highly+compressed
    • http://tefesad.growingupguinn.com/uploads/1/3/1/8/131871462/degujujogixefeguzura.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/2269/4046/files/73976978863.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40369191557.pdf
    • https://cdn.shopify.com/s/files/1/0437/6687/4266/files/3526994979.pdf
    • https://cdn.shopify.com/s/files/1/0438/4748/3557/files/canzoniere_petrarch.pdf
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/xitubenatuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6269/files/15518694170.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xezunegudowafosixezuvi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2366/2236/files/android_studio_java_version_8.pdf
    • https://cdn.shopify.com/s/files/1/0436/1483/0749/files/agile_mind_constructed_response_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1607/files/konozulevidubuzu.pdf
    • https://cdn.shopify.com/s/files/1/0457/6690/1924/files/consumer_reports_stick_vacuum_cleaners.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/lojazojozox.pdf
    • https://cdn.shopify.com/s/files/1/0434/0783/5303/files/daxuvunusax.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006443.bin
371df747392d0fa57e7d844170e10e694d9d5e186028b4803ce94fbd67a5a658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6443 5704 bytes
font_01_sfnt_off0000777a.bin
43bf4d457f5b53ea37fabd132f8277f94f69971a75b8c194638acec93a99d5ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x777A 14196 bytes
font_02_sfnt_off0000a495.bin
b1615e29a4fe6c7320d553a30418b4fece26933a192be804fa4a6c1955e67a67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA495 16068 bytes

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