Malicious PDF — malware analysis report

Static analysis result for SHA-256 62fbf8b42d57dce1…

MALICIOUS

PDF

50.2 KB Created: 2020-07-23 11:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0445efed5097ad798431193ecc1bfe5 SHA-1: f03bc2976d0b74cad17302262b587307c9efdcf4 SHA-256: 62fbf8b42d57dce14db8257cb2cb6a32008fb5e7721726f1482783cb885df70c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, and another for being a link farm with 17 external PDF links. The document body, though heavily obfuscated, contains text related to 'behavioral theory of smoking pdf', likely a lure. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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.cc/pify?keyword=behavioral+theory+of+smoking+pdf
    • http://files.saleopardhunting.com/uploads/1/3/1/3/131380471/xurirajobi.pdf
    • http://files.norwegianmade.com/uploads/1/3/1/3/131398380/2554e3016c57.pdf
    • http://files.socialvalueworld.com/uploads/1/3/1/3/131381677/5836811.pdf
    • http://files.matthewkadey.com/uploads/1/3/0/7/130738621/9465999.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7835/2022/files/datanizejo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1473/3480/files/vizumovugokolifota.pdf
    • https://cdn.shopify.com/s/files/1/0436/7027/4201/files/25591290060.pdf
    • https://cdn.shopify.com/s/files/1/0437/6359/7466/files/pasazewatarobegasatep.pdf
    • https://cdn.shopify.com/s/files/1/0429/4161/2199/files/5232702375.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/4993/4229/files/wekawazowewegam.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4021/files/mukigi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6663/files/44970449705.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/88704067033.pdf
    • https://cdn.shopify.com/s/files/1/0432/5061/4429/files/takepamifumominawabarumup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gojifazuxosupimuron.pdf
    • https://cdn.shopify.com/s/files/1/0432/8819/9328/files/68668378160.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_off00008520.bin
95557004157c685e92d6c1b2db4cee0c08a32876262c88b524063b0b2476abf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8520 5516 bytes
font_01_sfnt_off000097d1.bin
e39eebc20bb66d0a4de42de775f5251a4db5afda92df243d495d3cdba06fe5fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97D1 10788 bytes

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