Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9c9e7bae5a9ef2…

MALICIOUS

PDF

39.1 KB Created: 2020-08-03 01:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3e0f325270308a6485c87ea7b97670e SHA-1: fb5fa04c58ebc48fcfc7149b2bbf2ddc318ef146 SHA-256: 7f9c9e7bae5a9ef2722089b6a94cd5cdaace4374376057851fb54e83b62faa8c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=how+to+remove+emoji+from+text+php'. The document body, though partially corrupted, contains text related to the URL's keyword, reinforcing the lure. 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.ru/pify?keyword=how+to+remove+emoji+from+text+php
    • http://files.kidsalldressedup.org/uploads/1/3/0/9/130969656/7eac376.pdf
    • http://files.randjexpressions.com/uploads/1/3/1/4/131453623/muxurete-kaxuponabuvaj-sikuwuwebajuni-wifomazepuzekiz.pdf
    • http://wemifo.lunationgeckos.com/uploads/1/3/2/6/132681504/votifunaroj_sebibewiva.pdf
    • http://files.bazarartandgifts.com/uploads/1/3/0/8/130874431/3952320.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4263/4917/files/50259031259.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/43214173013.pdf
    • https://cdn.shopify.com/s/files/1/0428/3914/6662/files/27713030543.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0826/files/53483780763.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7796/files/lejoker.pdf
    • https://cdn.shopify.com/s/files/1/0432/0080/7070/files/sojugenije.pdf
    • https://cdn.shopify.com/s/files/1/0432/0467/3697/files/2895221921.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8276/files/gixodetuvu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0903/2863/files/suguwonanevobarazipubuw.pdf
    • https://cdn.shopify.com/s/files/1/0435/5063/8241/files/dekalb_county_parks_and_recreation.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0226/files/taromiwelevugaxuvuvowim.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cc3.bin
483fe70fe2faf58771a31c180a7a95ef3a4ad138a27ee14f1a173891c04c7638
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC3 4976 bytes
font_01_sfnt_off00006da4.bin
8e9e2a6fa071dbcb01e0ca6d2b876ce89f4fb9a25a12263cc9d06e1d7d1a360f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA4 10012 bytes