Malicious PDF — malware analysis report

Static analysis result for SHA-256 efba64beb28855e4…

MALICIOUS

PDF

40.0 KB Created: 2020-08-13 02:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8e027dcdd7bfb8140d54da567f552ba SHA-1: 66e1cd00305f6e207bc0a45ade036b1234ba0bc9 SHA-256: efba64beb28855e4a389de66360266db4b74dcf2c574982c795be7643f2d1d58
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to further malicious content. The document body, though partially corrupted, contains the same URL and references a topic ('air pollution essay in odia pdf') likely intended to entice clicks. The presence of a large number of external PDF links, many pointing to Shopify domains, suggests a link farm or SEO manipulation tactic to distribute the malicious redirector.

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=air+pollution+essay+in+odia+pdf
    • http://kifur.camarillocommunitygardens.org/uploads/1/3/1/6/131606490/fefuladuzupoful-wuvip-vabom.pdf
    • http://gefes.kthmc.com.np/uploads/1/3/1/4/131407558/47205c.pdf
    • http://files.martinezsoccer.com/uploads/1/3/0/7/130738512/5660076.pdf
    • http://files.deathcog.com/uploads/1/3/1/4/131438077/jafirujos.pdf
    • http://files.stampinwithtulena.com/uploads/1/3/1/4/131453241/topokagikatot-jojosubeferu-jexete-bifagoxa.pdf
    • https://cdn.shopify.com/s/files/1/0437/8414/3010/files/25061533702.pdf
    • https://cdn.shopify.com/s/files/1/0433/3794/1160/files/tamil_meaning_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0434/3565/5335/files/86163231502.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4637/files/61557226999.pdf
    • https://cdn.shopify.com/s/files/1/0435/6197/5971/files/libro_adrian_paenza.pdf
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/sony_xplode_car_stereos.pdf
    • https://cdn.shopify.com/s/files/1/0435/9307/2808/files/rajakita.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xuvoba.pdf
    • https://cdn.shopify.com/s/files/1/0433/5281/7832/files/23350469382.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/46158276749.pdf
    • https://cdn.shopify.com/s/files/1/0437/9105/7058/files/all_ayurvedic_medicine_list.pdf
    • https://cdn.shopify.com/s/files/1/0441/0654/7352/files/liwevoboraxupajaraneravak.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_off00005f0a.bin
fbc0e0b9e6effd33fdc7a972e466d0e29162a7dc9ad276d8ab9b46a2f1dd8d43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0A 5128 bytes
font_01_sfnt_off0000708c.bin
90332882e2dbeda7b05847a7f242e6910fb3014c70da606d84e3109c55a492ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708C 10180 bytes

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