Malicious PDF — malware analysis report

Static analysis result for SHA-256 7033b3ad5184c529…

MALICIOUS

PDF

45.7 KB Created: 2020-08-16 12:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 414e25f21ed47506d4ad48f20588d700 SHA-1: 655f220fab664e2ba4895b1c56399e62cca8f294 SHA-256: 7033b3ad5184c5292941e10b27df8b03d49e27be552d21567f51a5a177c1c63b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=bpsc+answer+key+with+question', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is an 'answer key', likely a lure to encourage clicks. The presence of numerous other PDF links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic. No scripts were extracted, but the malicious link is the primary indicator of compromise.

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.ru/pify?keyword=bpsc+answer+key+with+question
    • http://files.fcdetail.com/uploads/1/3/0/7/130739175/kaloxetusotat-jemezizi.pdf
    • http://files.nickdolanmusic.com/uploads/1/3/2/6/132681891/sijebirajiloxolika.pdf
    • http://files.eriedips.com/uploads/1/3/1/4/131437689/rimagariwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0428/7637/1110/files/advantages_and_disadvantages_of_whistleblowing_in_organisation.pdf
    • https://cdn.shopify.com/s/files/1/0428/7266/8319/files/argonautas_livro.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8845/files/jezazufetilejaveladarij.pdf
    • https://cdn.shopify.com/s/files/1/0444/7030/4935/files/espn_nfl_2k5.pdf
    • https://cdn.shopify.com/s/files/1/0449/3682/2939/files/b_f_skinner_theory_of_learning.pdf
    • https://cdn.shopify.com/s/files/1/0435/1016/9759/files/kathem_al_saher.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4634/files/85646233103.pdf
    • https://cdn.shopify.com/s/files/1/0433/7264/2460/files/65404720617.pdf
    • https://cdn.shopify.com/s/files/1/0433/8925/5847/files/neoplasia_endocrina_multiple_1_y_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/garth_brooks_torrent.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ecb.bin
27014396c359aca9080083a61d0b08ac2ee66f00e03529dd4e43d6a40cb4131b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECB 5424 bytes
font_01_sfnt_off00007150.bin
cfeb8ac43e33b84f875c4e8335fdc2aaa11555ec24fdb3e13438f20b5254f58a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7150 10224 bytes
font_02_sfnt_off0000945a.bin
94d87a3fd8e8d6ab4dea47d4470f7e7ac83005db0160ee134c0f9996e69a5596		 pdf-font-stream PDF embedded font (sfnt) at offset 0x945A 6080 bytes

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