Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb56b77f9cc378a…

MALICIOUS

PDF

43.7 KB Created: 2020-08-24 10:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 164a9680ea14547cba426a86cff09d0b SHA-1: 1bd80d5393b319a547945ab6d4eec94d53e1be95 SHA-256: bdb56b77f9cc378ac258e01368605f37a46d5c02a89ecf4387a67142aea6ace9
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a template for an employee letter of recommendation. The ML classifier strongly indicated maliciousness, and the PDF was found to contain a large number of external links, suggesting a link farm for SEO poisoning or traffic generation. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document.

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=employee+letter+of+recommendation+template+word
    • http://files.herbstoknow.com/uploads/1/3/1/4/131454505/loxudejumekeje_wakixara.pdf
    • http://files.almeria-estates-and-realty.com/uploads/1/3/1/4/131437351/fefozo.pdf
    • http://files.schecktech.com/uploads/1/3/1/3/131381910/wixakuzaguk.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0201/files/kukenemenabal.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/75607174797.pdf
    • https://cdn.shopify.com/s/files/1/0428/5795/5487/files/haryana_hssc_answer_key_group_d.pdf
    • https://cdn.shopify.com/s/files/1/0430/8015/5289/files/lepan.pdf
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/pazusolasaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/fomudosajafafirek.pdf
    • https://cdn.shopify.com/s/files/1/0432/3111/7467/files/18813322245.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9305/files/19975768915.pdf
    • https://cdn.shopify.com/s/files/1/0431/7973/7237/files/76875184287.pdf
    • https://cdn.shopify.com/s/files/1/0430/2068/1369/files/65203500641.pdf
    • https://cdn.shopify.com/s/files/1/0436/1653/4685/files/tekken_7_cheat_engine.pdf
    • https://cdn.shopify.com/s/files/1/0437/9970/7810/files/44157005260.pdf
    • https://cdn.shopify.com/s/files/1/0437/7932/6110/files/94007385280.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_off0000609d.bin
f5612514b4923b9faf44e4f74c18f582be0312d8e20c9369335179fb52d5b14b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x609D 5064 bytes
font_01_sfnt_off000071d2.bin
41475889708ef30d95e26f39b1bd270a959b16cce5d8d23082a90a632a1d7dbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D2 9884 bytes
font_02_sfnt_off00009371.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9371 4324 bytes

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