Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd425aa95c7ba3c7…

MALICIOUS

PDF

50.9 KB Created: 2020-07-27 00:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23dd2d1178da1152c608528ee63d61d5 SHA-1: d70c6a71b441339a338e3670f7832390ac7e2709 SHA-256: fd425aa95c7ba3c752afcad7a848abce620dc626c6ad7e405186b02201d155e9
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'countif not working google sheets', suggesting a lure to a potentially malicious site disguised as a helpful document. 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=countif+not+working+google+sheets
    • http://files.worldofgoodtravel.com/uploads/1/3/0/7/130776517/veroduxo_wisebu_babunefowapa.pdf
    • http://files.eponaequestriandesign.com/uploads/1/3/2/6/132696174/gabujitad.pdf
    • http://files.ohswolverineband.com/uploads/1/3/0/8/130874316/9f60dd0c5996e.pdf
    • http://files.floridahuntingoutfitter.com/uploads/1/3/1/3/131378821/motefunukat-dewilatapogibu-wepopemuwini.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1651/files/kejibita.pdf
    • https://cdn.shopify.com/s/files/1/0432/8987/0491/files/54337710800.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/37289981233.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6702/files/70561667518.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vaxopegi.pdf
    • https://cdn.shopify.com/s/files/1/0436/3547/4590/files/42315998036.pdf
    • https://cdn.shopify.com/s/files/1/0431/3071/6322/files/giwasudenamorozitezusujoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/4153/7696/files/37665630055.pdf
    • https://cdn.shopify.com/s/files/1/0438/9309/6600/files/46422943054.pdf
    • https://cdn.shopify.com/s/files/1/0432/4904/1563/files/gixojuzabupupaderojubuxeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/4788/6743/files/lolefakexadojuf.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_off00008945.bin
af5b8f725408a1411fe47e3f2c9980d9361d99f074e397b4d7927ef890a24901
pdf-font-stream PDF embedded font (sfnt) at offset 0x8945 4880 bytes
font_01_sfnt_off000099f2.bin
d9a4d208271446431f499d1012c45865b828b36141c5ad9e4ff762e963b806f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x99F2 10740 bytes