Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e83fc7fabfd653…

MALICIOUS

PDF

41.5 KB Created: 2020-08-07 01:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27ec6fb3baecd41f3b9b0c2559a64819 SHA-1: f06d3591a4f9f172db4522cb1923d5569a3dcb3f SHA-256: f8e83fc7fabfd653c2477813bcb5ab149381e3a96596a562e42fd50f5f28e9bd
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL is https://ttraff.com/pify?keyword=bmi+metric+chart+pdf, which is presented within the document body. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated but contains references to the malicious URL and numerous other benign-looking Shopify URLs, likely part of a SEO link farm tactic.

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=bmi+metric+chart+pdf
    • http://files.hughbrewster.com/uploads/1/3/1/4/131437352/4330998.pdf
    • http://files.advancedbenefitscorp.com/uploads/1/3/2/6/132681544/b8930929688.pdf
    • http://files.sarahkramerharrison.com/uploads/1/3/0/7/130739456/97443d026668.pdf
    • http://larajir.rim-foundation.org/uploads/1/3/1/4/131453284/cd02d.pdf
    • https://cdn.shopify.com/s/files/1/0432/5697/1432/files/xubemabukukuvedunuretu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5461/9041/files/97530557723.pdf
    • https://cdn.shopify.com/s/files/1/0430/1373/4563/files/40992631414.pdf
    • https://cdn.shopify.com/s/files/1/0435/3366/4408/files/42029620157.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2623/files/7783936973.pdf
    • https://cdn.shopify.com/s/files/1/0434/7265/0397/files/62198663633.pdf
    • https://cdn.shopify.com/s/files/1/0432/5058/1662/files/sims_4_pool_update_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/82357532613.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/5984618871.pdf
    • https://cdn.shopify.com/s/files/1/0437/4390/3905/files/kevozedapidijumuge.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/rebawarefuge.pdf
    • https://cdn.shopify.com/s/files/1/0427/9461/4940/files/62785692186.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/convert_to_csv_file_for_free.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_off0000634c.bin
2e492d8f8e743096c46e12939fb76b9003786355403d4bd74b3a402ed33862e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x634C 5236 bytes
font_01_sfnt_off000074f2.bin
e7c1741b6447d28682fd736d955626384a5c6b1177d1452822a25697a4d1dba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F2 10580 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.