Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c13f6cca8576956…

MALICIOUS

PDF

52.2 KB Created: 2020-09-02 07:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 424792bea9a25dffe5435266c43519f0 SHA-1: 7d69a961a38e3eefcda19385705c7f45e153178a SHA-256: 6c13f6cca8576956dee4b448a916432437c00d0ad1f7ddb51b83b7e1f918de8a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself appears to be obfuscated or corrupted, but the presence of the malicious URL and the link farm heuristic suggest an attempt to redirect users to malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/wix?keyword=bogan+tamil+movie+super+scenes
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://static.usrfiles.com/ugd/93971e_fa834770a92748d48fdac97172946fa2.pdf
    • https://static.usrfiles.com/ugd/544c7e_6b7d3b2de0854854ab325f5faee6ab8d.pdf
    • https://static.usrfiles.com/ugd/48f461_50215951f3cd4de394226dca84f1831c.pdf
    • https://static.usrfiles.com/ugd/36f25b_42d5a3233dac4d6cb732476b7a0164f2.pdf
    • https://static.usrfiles.com/ugd/e1d12c_75f4615d4242461f99068568b0612da4.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/43066067178.pdf
    • https://cdn.shopify.com/s/files/1/0436/9098/3574/files/tosijuji.pdf
    • https://cdn.shopify.com/s/files/1/0432/2518/6466/files/74112363396.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/20374225796.pdf
    • https://cdn.shopify.com/s/files/1/0436/4196/2649/files/bedurakidilu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9387/7145/files/42263520534.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/madusululabu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0087/files/international_financial_reporting_standards_ifrs_2019.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ffc.bin
aabfec882bb88de5eb40c25602883c6c7fee29f2382160cfe8f0550f642d6010		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFC 3120 bytes
font_01_sfnt_off00006b25.bin
bb3b9beee5bf47e85fd7920b1ff8fd86295401b8207a4cfec2fef81524b0194a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B25 5360 bytes
font_02_sfnt_off00007d58.bin
be6e68b77845b3261182db22b0c20e0c87943edf14d59414701ab8b7fbe003b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D58 3084 bytes
font_03_sfnt_off000089fd.bin
61d6f4d98d872f2352876d033c153fd40ce0f03b991c2867cbfe3abb8075489e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89FD 10588 bytes
font_04_sfnt_off0000ae6e.bin
bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6E 16060 bytes

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