Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1b8becd5472db9…

MALICIOUS

PDF

49.8 KB Created: 2020-08-06 08:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7bd52197c87ef4df77083a567841407 SHA-1: 804cb2ccd6295adf2424d552a1d1c706d78c49d0 SHA-256: ba1b8becd5472db9546ca8a6145a2de8eeb2b1c93380037ff56901910cc85b4d
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, https://ttraff.ru/pify?keyword=great+writing+4+answer+key+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to 'great writing 4 answer key pdf', suggesting a phishing or scam attempt. 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=great+writing+4+answer+key+pdf
    • http://files.jackienorman.com/uploads/1/3/1/8/131860787/xewaguxevaxo_xarak.pdf
    • http://files.unfilteredperspectives.com/uploads/1/3/2/6/132695200/pazirarojog_jolab_pupoduziwoveza.pdf
    • http://files.headofthekas.com/uploads/1/3/1/8/131856333/8113225.pdf
    • http://fetowox.secludedacrescampground.com/uploads/1/3/1/4/131453574/5028574.pdf
    • http://wumosow.cdestem.com/uploads/1/3/1/4/131409090/kasupokeveto_wezavanepomi_rirebi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/24753112409.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/99486921240.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/gujazeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/3658/9730/files/wirunafasoxiniduxavakexoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/5993/files/78321001829.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/painter_s_algorithm_in_computer_graphics.pdf
    • https://cdn.shopify.com/s/files/1/0434/0934/2621/files/zojobasolarukuxexexet.pdf
    • https://cdn.shopify.com/s/files/1/0439/1672/2344/files/bixovejis.pdf
    • https://cdn.shopify.com/s/files/1/0430/7802/5377/files/zakojadi.pdf
    • https://cdn.shopify.com/s/files/1/0438/0514/7298/files/brochure_maker_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3785448733.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_off00007682.bin
efc12a9894293b9b83a6d7edc66eaeb4951e043648470ef66afa906b96420488		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7682 5232 bytes
font_01_sfnt_off00008886.bin
f4a1b766107f3387dab69be623178d7d522c4ca0208b9f999f71ae596880493d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8886 10408 bytes
font_02_sfnt_off0000ac12.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC12 4324 bytes

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