Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bf501494102c37…

MALICIOUS

PDF

60.2 KB Created: 2020-08-12 16:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c0d7c01432914ba5b22518545944fd5 SHA-1: 7c4ed6be3819e0b5c09872f33b9926d1901a8dda SHA-256: c3bf501494102c378d995a3d29f7e374b83623b1ff6dd7191b787dea08d31bbb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with a primary malicious redirector URL. The document body, though heavily obfuscated, contains the text 'Inorganic chemistry books for msc pdf' and the malicious URL, indicating a lure to download a fake PDF. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link leads to known malicious infrastructure.

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=inorganic+chemistry+books+for+msc+pdf
    • http://tuvubura.grasshoppervapesllc.com/uploads/1/3/1/4/131407222/b4e3b1e1767d4.pdf
    • http://files.calibrothers.com/uploads/1/3/1/4/131437018/guxowos.pdf
    • http://nivow.huronbirth.com/uploads/1/3/2/7/132740873/fudoluduvutixim.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3658/files/463298507.pdf
    • https://cdn.shopify.com/s/files/1/0428/3521/4503/files/pitapu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3489/3718/files/getosovopep.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/makelokiberitamud.pdf
    • https://cdn.shopify.com/s/files/1/0429/2578/5255/files/menudugas.pdf
    • https://cdn.shopify.com/s/files/1/0437/7142/9016/files/88957594644.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/52420696070.pdf
    • https://cdn.shopify.com/s/files/1/0433/8548/7516/files/internal_exception_java_lang_nullpointerexception.pdf
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/jalalanokokalivapu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6695/files/cambio_de_a_word_online_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/5581/6599/files/selekagowepotegibusa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0632/7959/files/18180289139.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/butibarunivelekusamu.pdf
    • https://cdn.shopify.com/s/files/1/0438/6082/0133/files/xugejekugoma.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/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080fa.bin
9d2e300240f40e3eaa0d6401cdb2ef06e268d18fba579869e69d2acfce16472b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FA 5780 bytes
font_01_sfnt_off00009474.bin
6032c3fa34283b9ac8af23d0718662115c6c111706b6c494ddf42754192cfbc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9474 2524 bytes
font_02_sfnt_off00009fb5.bin
026de1076dad6614fee7b4839f066e743e4238b5ddea94259138cfcd618330b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FB5 2320 bytes
font_03_sfnt_off0000aa07.bin
d249c716ce65c9bad716d7ccb67e944f92d1ca7d6ffb57fbf2ad118e2a3356e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA07 10060 bytes
font_04_sfnt_off0000ccc0.bin
7a7e0f9cb89785dee93ecfbcc78ef93b5a18a5022886c2d5a0bf15d9412c15a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 16224 bytes

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