Malicious PDF — malware analysis report

Static analysis result for SHA-256 f755a7822aa1a56c…

MALICIOUS

PDF

36.8 KB Created: 2020-09-13 00:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed509ad7c42c4a758ba1c8b020292705 SHA-1: d968759be987206a1816991bebf7ded9c904487d SHA-256: f755a7822aa1a56c0a80cc0ed97cf97cd05702ff74a204f6b6f2092d0a7efb40
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link is designed to lure users to a malicious site, likely for phishing or malware distribution. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external documents. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is sufficient evidence for 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.link/wix?keyword=better+homes+and+gardens+sheets+100+cotton
    • http://lamapexal.vicksburgbands.com/uploads/1/3/0/7/130740522/5609362.pdf
    • http://files.stonewallsaddles.com/uploads/1/3/1/8/131872273/gonowazipa-vupisijuk-wuvetimuzif-fatupo.pdf
    • http://files.mddedcelks.org/uploads/1/3/1/0/131070786/relexeverumajitux.pdf
    • http://fojize.elenamccoy.com/uploads/1/3/1/8/131856725/pimawuris_xabux_rifogamujor_podutewowofo.pdf
    • http://mupiv.millcreekscattledogs.com/uploads/1/3/0/7/130738848/4292333.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_3f45b3e44f04425ca90855728ad5f78f.pdf
    • https://static.usrfiles.com/ugd/6260fe_f7014fc9c74c4620b71b084c086dcaf4.pdf
    • https://static.usrfiles.com/ugd/32acb1_b95894db70dc4004882374e9fc0e3c2b.pdf
    • https://static.usrfiles.com/ugd/4c76bf_92055b76792b40d7808f9998591fabfd.pdf
    • https://cdn.shopify.com/s/files/1/0438/4273/2192/files/fuzawuru.pdf
    • https://cdn.shopify.com/s/files/1/0438/5813/3152/files/lupude.pdf
    • https://cdn.shopify.com/s/files/1/0431/7816/4387/files/emotional_and_behavioral_disorders.pdf
    • https://static.usrfiles.com/ugd/f0e51d_71d6b38d153a4a34a00f25f1fe241694.pdf
    • https://static.usrfiles.com/ugd/65e777_ca4275a1301c486592e7c7577abe78ff.pdf
    • https://static.usrfiles.com/ugd/66f7a0_856339f193bd44dca2112073dffd2226.pdf
    • https://static.usrfiles.com/ugd/97634b_756ba666d6744a988272dc3f3b10d8be.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fe3.bin
21d845d2c5025cdfe0547325f3d00565707685da16085486d4d2bf6921943ca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE3 5564 bytes
font_01_sfnt_off000062ab.bin
590a0b347180ddf36590b11d2eb02d26fdd43346ff8b9878dd5dc823a3b54d52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AB 10384 bytes

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