Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b4817f0ced99da…

MALICIOUS

PDF

44.8 KB Created: 2020-08-15 03:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f643656a71b6f7afc5747c5af28c95ac SHA-1: 757b5d975ae24b525884904dfa0ca924dbac04c4 SHA-256: 22b4817f0ced99da3bf1ce5d9a99f4c104e656e84369de918236e926d1ee662c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text that appears to be a lure for a "Durga chalisa pdf in kannada". The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. 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.com/wb?keyword=durga%20chalisa%20pdf%20in%20kannada
    • http://files.mtopag.org/uploads/1/3/2/8/132815123/pifebalodezapikawofo.pdf
    • http://files.eastmanbookshop.com/uploads/1/3/0/7/130740444/noduladigilos.pdf
    • http://files.llanomemorial.com/uploads/1/3/0/8/130874287/jitil.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1487/files/vaduf.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5235/files/wotesakaxetodo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4112/6565/files/rijofeveka.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9935/files/cro_oscilloscope.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98029452840.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/nomulinux.pdf
    • https://cdn.shopify.com/s/files/1/0433/2437/5195/files/les_catastrophes_naturelles_dans_le_monde.pdf
    • https://cdn.shopify.com/s/files/1/0438/9008/1960/files/fejijasewoxavumagizezupi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5814/2120/files/55875686216.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4668/files/foxit_phantom_editor_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6627/7531/files/amoeba_sisters_video_recap_prokaryotic_vs._eukaryotic_cells.pdf
    • https://cdn.shopify.com/s/files/1/0440/0106/7166/files/98527075565.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_off00006452.bin
9d0544f24878af3570b014a5e508b61ac677ccbacfdd879ebc306e2876580e66
pdf-font-stream PDF embedded font (sfnt) at offset 0x6452 5480 bytes
font_01_sfnt_off000076f3.bin
f17801ce33fab7e3f7df3a4dae0cf0188327facbb5d2df8bc8874112d9945bc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x76F3 15396 bytes