Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f8154501da1918…

MALICIOUS

PDF

44.6 KB Created: 2020-08-28 01:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c687f2ac0f0d6b72532fabf7c889a30e SHA-1: 5929df16a510beda297e8a515b0cd818c5b20fec SHA-256: c5f8154501da19186e7a5c34a3ab747f6d7ff46f76e5135aaa590b0b139cd8d7
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of an SEO link farm, embedding a large number of links to external PDF files, many hosted on Shopify.com. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.me/pify?keyword=pin+evolution+guide+twewy'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the same redirector URL, suggesting an attempt to lure users to malicious content.

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.me/pify?keyword=pin+evolution+guide+twewy
    • http://bumibezo.nejcrwc.com/uploads/1/3/0/7/130739235/kamikifo.pdf
    • http://files.sdsimages.com/uploads/1/3/2/8/132815752/1413500.pdf
    • http://files.rosehavengoldens.com/uploads/1/3/2/6/132681758/fd11dda12a.pdf
    • http://files.lifeinglitter.com/uploads/1/3/2/8/132816036/niriw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/git_submodule_remove.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/72954173859.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/solidworks_surfacing_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0435/0597/5462/files/tigray_amharic_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0444/2878/7878/files/sportster_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/4102/1334/files/wanugevoduvafipurobebuge.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/refemeletux.pdf
    • https://cdn.shopify.com/s/files/1/0432/6139/5102/files/wabimava.pdf
    • https://cdn.shopify.com/s/files/1/0431/0594/3701/files/graphing_systems_of_equations_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/boris_the_bullet_dodger.pdf
    • https://cdn.shopify.com/s/files/1/0432/9170/5500/files/fevetow.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_off0000663b.bin
6156684aa68373716910bb02869dbf48955b13ab672e7211a6870710208d4076
pdf-font-stream PDF embedded font (sfnt) at offset 0x663B 4764 bytes
font_01_sfnt_off0000769e.bin
10976c0653f162760520d91a179b2927ac1fa607ada3c95b689e1f4018646479
pdf-font-stream PDF embedded font (sfnt) at offset 0x769E 15124 bytes