Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0e342c2d046fa2…

MALICIOUS

PDF

41.1 KB Created: 2020-08-07 01:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38aca759ff908594779f3cc77a83cfbe SHA-1: e4c8d5d7ed9058fdd36a60acdf63df37af71c45e SHA-256: 7f0e342c2d046fa2cb7016d028a909cc016ed31c0ca02f6d4ddc59f5b4de46f5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to distribute malware. The ML classifier strongly supports maliciousness. No scripts were extracted, but the primary attack vector is the malicious redirection URL.

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.com/pify?keyword=the+easy+guide+to+jazz+guitar+arpeggios+pdf
    • http://files.lyricsandpoems-cacreed.com/uploads/1/3/0/8/130814351/e60d8a4e.pdf
    • http://files.donnavarnsosteopathy.co.uk/uploads/1/3/1/4/131407901/1391923.pdf
    • http://files.hansenmath.org/uploads/1/3/0/7/130739404/wafotepe-mabinamisuj-jaxosaleguboku-mesojupapoton.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/lomubeze.pdf
    • https://cdn.shopify.com/s/files/1/0434/4512/5281/files/iron_maiden_wasted_years_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/the_sniper_short_story.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/suramagufumaxuragozud.pdf
    • https://cdn.shopify.com/s/files/1/0430/3912/9751/files/common_accounting_terms.pdf
    • https://cdn.shopify.com/s/files/1/0434/7258/4861/files/52540715303.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/tugevatobexolilusozasape.pdf
    • https://cdn.shopify.com/s/files/1/0438/7730/2427/files/29533417391.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/tefoxobupowotodokerebo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruketisoren.pdf
    • https://cdn.shopify.com/s/files/1/0431/6839/9524/files/centrifugal_fan_theory.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/java_se_platform_binary_not_responding.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_off000063c2.bin
730e88b5906b2f65d25859c661097bfce10f3f4ada35db1f3fdbeb6646752a5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x63C2 5448 bytes
font_01_sfnt_off0000765a.bin
5afe18771d6c28e646b3153569546db7c0852d6c25a40b3146cee4cdaacd0fb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x765A 9704 bytes