Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efb07c580e804e2…

MALICIOUS

PDF

60.1 KB Created: 2020-08-06 06:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc4948a948517d0bd70e63a903721cf1 SHA-1: 47bc86263c5943a880f36de48e71c1fbacab0a35 SHA-256: 8efb07c580e804e222181ba25db88c23b017f40c1cace4622421dae750521b15
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector link. The document body, though partially corrupted, contains text related to 'best pdf reader for ipad air' and the wkhtmltopdf tool, suggesting a lure. The presence of a large number of external links, many hosted on cdn.shopify.com, further supports the SEO link farm heuristic. The ML classifier also strongly indicated maliciousness.

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=best+pdf+reader+for+ipad+air
    • http://files.ourstodiscover.ca/uploads/1/3/0/7/130738565/3fa1b686bb1.pdf
    • http://zinemig.bridesewbeautiful.org/uploads/1/3/2/3/132303382/a7962676.pdf
    • http://files.tutoryounsu.net/uploads/1/3/0/8/130874250/jixojiworirunukov.pdf
    • http://files.venezuelanscryforfreedom.com/uploads/1/3/1/0/131071315/3788680.pdf
    • http://kexonet.theguitarengineer.co.uk/uploads/1/3/1/4/131406086/tafukasugi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1341/3786/files/21174926497.pdf
    • https://cdn.shopify.com/s/files/1/0428/3678/7356/files/61640685101.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/lavuravamet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/31325127626.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9477/files/kizoxerimuvomabejiwapo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/36490481941.pdf
    • https://cdn.shopify.com/s/files/1/0432/1011/3188/files/sokijitasofevilese.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/kirotosafuvojuku.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/29468125760.pdf
    • https://cdn.shopify.com/s/files/1/0429/3731/9590/files/40313890540.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewugokujugiwiburonanas.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3941/files/4951680202.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009897.bin
7a088c9cb7e546680c01f56221250daec558588f58f35333ae26dd2a4f5127ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9897 5052 bytes
font_01_sfnt_off0000a9d8.bin
bdfea50f6870b91b93231a0868e1427319914005b821eeadf1d0ca745022c6ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9D8 10620 bytes
font_02_sfnt_off0000ce50.bin
c3be742f6a020815803d05fff1e645848f57f04b98e8699fb29e0505bc7e0203		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE50 16108 bytes

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