Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14d4fcb868b1e9d…

MALICIOUS

PDF

43.3 KB Created: 2020-08-30 17:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b66eb73cb5b02ba19213deb09468bfcc SHA-1: 8509ae8c2cf478176bf3fba8f5b8eead04119d4c SHA-256: a14d4fcb868b1e9dd4588718441b442b5040335477e71383461a5e848be2c148
150 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.cc' which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for a free PDF download, specifically mentioning 'biochemistry satyanarayana 5th edition pdf free download'. This indicates a phishing attempt to redirect users to malicious infrastructure. The presence of numerous links to static.usrfiles.com, while flagged as benign, suggests a link farm used to distribute the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=biochemistry+satyanarayana+5th+edition+pdf+free+download
    • https://static.usrfiles.com/ugd/b8c837_ae6b6a3abb8f4e8797b7cd5b917673a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c266b54b4b447ba8891eae0752843d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_b98bb2402670435e9064fa46bdc5ad28.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa1f752720434b9f9ac4a1fb941376a8.pdf
    • https://static.usrfiles.com/ugd/289c5e_d1c094382e004548936c392898465141.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb7597026f9b4837ac99584f58d023c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_3760a391cc2b4da189a954bec98d68ea.pdf
    • https://static.usrfiles.com/ugd/77d535_23ec6ffdc54e4e8db15596b24cdaf33e.pdf
    • https://static.usrfiles.com/ugd/74c34a_ef927d36cdf241758982948a581597cc.pdf
    • https://cdn.shopify.com/s/files/1/0449/5589/3928/files/deck_the_halls_with_boughs_of_holly.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0850/files/83592925793.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4001/files/8661790783.pdf
    • https://cdn.shopify.com/s/files/1/0437/4737/7301/files/nilukugewezamezakux.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_off000068bf.bin
85ca9606966358a32356ec6d9d37348572f1e6012d937bdea15ea065a2e0b373		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BF 5760 bytes
font_01_sfnt_off00007c4a.bin
64c22d845d8451f9d70b5862adce6ea42db596fd061fe0471db7050217d3bfe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4A 10536 bytes

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