Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b18d84429331705…

MALICIOUS

PDF

48.4 KB Created: 2020-07-24 02:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbef304c73b2592657fb29698bdaed4b SHA-1: b7a5484f1f2d8c50fa4c9c2058f0a5bb1093cc27 SHA-256: 2b18d844293317050fac84a89c82820d45661d662cc166fd91fe681742b32835
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The embedded links likely serve as a lure to download further malicious content or lead to phishing sites. The document body is heavily obfuscated and does not provide clear textual clues.

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=avidemux+free++32+bit
    • http://files.eileenmshinners.com/uploads/1/3/0/8/130874029/xupamoxosidexejugo.pdf
    • http://files.zamdevelopsj.org/uploads/1/3/1/1/131164534/7449164.pdf
    • http://files.buildingbrilliantlives.com/uploads/1/3/1/1/131164118/tenis.pdf
    • http://files.ethnomusicologyinaction.org/uploads/1/3/2/7/132740804/d8611b64.pdf
    • http://files.straightoutscribes.com/uploads/1/3/0/7/130775737/d76efb1276dd882.pdf
    • http://files.ethnomusicology
    • https://cdn.shopify.com/s/files/1/0437/1054/6070/files/tovef.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9730/files/4882483378.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/kikizisawoduwikarosekek.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/77736340168.pdf
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/98111870682.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1829/files/ralofujidorej.pdf
    • https://cdn.shopify.com/s/files/1/0433/4570/7162/files/65565363529.pdf
    • https://cdn.shopify.com/s/files/1/0436/8980/3941/files/sijexezexidebakiputovi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5526/8519/files/64805509014.pdf
    • https://cdn.shopify.com/s/files/1/0433/0576/2974/files/tidosov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0433/6589/2261/files/94742014051.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/87411351781.pdf
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/2825468711.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_off00007ec4.bin
b42ff0a8bc2e0ef849c8b014468dbbff14a105c0986a9820d396f03ce4bda661		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC4 4852 bytes
font_01_sfnt_off00008f4e.bin
8e3f66cc354f01fb53e110be53fc0238622724996d92d3231471533bc8707d93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4E 10896 bytes

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