Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa3c9a954cec400…

MALICIOUS

PDF

39.3 KB Created: 2020-07-27 23:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c516195144f2b7cf9ac04aa42a335721 SHA-1: d268795f20669f3edc16f21c3e7009d5ff127ef0 SHA-256: aaa3c9a954cec400c47e6b16c744aefffe0720d96d6f94501295d97620c6c26b
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a 'chemistry laboratory manual book'. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, indicates a link farm strategy to obscure the ultimate malicious destination.

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=chemistry+laboratory+manual+book
    • http://files.egwt.ca/uploads/1/3/1/4/131453252/2199424.pdf
    • http://files.byraephotography.com/uploads/1/3/2/7/132740327/saxiki-ruradevabozon-loresesa-zigojis.pdf
    • http://files.simixagriculture.com/uploads/1/3/2/6/132695294/0360bb4635472.pdf
    • http://files.galwayhairandlashco.com/uploads/1/3/0/7/130739480/sonit-rotujiw-bowowemo.pdf
    • http://files.intelligentwoundcare.com/uploads/1/3/1/3/131379085/vedivi_pegugikavu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7963/files/53215688899.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/pejivawadeli.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/bigulefutovoguteribabile.pdf
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/76796349885.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/55162639411.pdf
    • https://cdn.shopify.com/s/files/1/0440/6630/8246/files/tesabuxexesezagoruxapidi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/jikupinerigim.pdf
    • https://cdn.shopify.com/s/files/1/0431/5394/8836/files/63889909730.pdf
    • https://cdn.shopify.com/s/files/1/0437/5894/4405/files/fiwiwobuzowifijipa.pdf
    • https://cdn.shopify.com/s/files/1/0440/1656/6422/files/72659983117.pdf
    • https://cdn.shopify.com/s/files/1/0439/6879/0686/files/pasorawugofesoseduk.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/
    • https://cdn.shopify.com/s/files/1/0432/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c29.bin
d4925173491d2c7596173458a4bd20af56fc5270557657a589dc5859e3fbd375
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C29 5136 bytes
font_01_sfnt_off00006d7b.bin
e2e8532924dc4618836579c33e06d29b03c683bf556c9ac470ccebea3880d0ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7B 10152 bytes