Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37682e8cc48ea62…

MALICIOUS

PDF

44.6 KB Created: 2020-08-20 08:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8c0294c7ed4108397e85f8255f8a5cf SHA-1: 041a2dc44e626ac8e0ae9816ca6e7192d2d052b1 SHA-256: c37682e8cc48ea628b2415ecfd257522fd658192e1dbb8e09964a680fb38127e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, which is the primary indicator of malicious intent. The document body, though partially corrupted, suggests a lure related to 'mountain bike gear shifting', which is likely a pretext to encourage clicking the embedded malicious URL. The presence of numerous external PDF links, many hosted on Shopify, further supports the link farm heuristic, indicating a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=mountain+bike+gear+shifting+guide
    • http://files.ozarkcountryoutfitters.com/uploads/1/3/0/7/130775145/gosilesid.pdf
    • http://files.nmbseminar-sd.org/uploads/1/3/1/3/131398197/d34290c.pdf
    • http://files.lainejaderbergassociates.com/uploads/1/3/0/9/130968943/f5ac1f4bf8e2451.pdf
    • http://fivafeve.christinagdennehy.com/uploads/1/3/2/6/132682879/fibepesugiwarefon.pdf
    • http://files.mistoyo.com/uploads/1/3/0/8/130873718/2630512.pdf
    • https://cdn.shopify.com/s/files/1/0429/7578/9215/files/99544768535.pdf
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/kukogomap.pdf
    • https://cdn.shopify.com/s/files/1/0440/8265/9493/files/rakuban.pdf
    • https://cdn.shopify.com/s/files/1/0428/3373/9932/files/zesevizamawo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/82595467958.pdf
    • https://cdn.shopify.com/s/files/1/0433/9286/0327/files/stihl_fs_250_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/9779/2420/files/62322313827.pdf
    • https://cdn.shopify.com/s/files/1/0431/0849/9618/files/bofugenuzosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2007/4663/files/80822707311.pdf
    • https://cdn.shopify.com/s/files/1/0431/9785/7954/files/13418151452.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54440827626.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8821/files/dosiwesemup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9937/4233/files/kenatubipapitofaxib.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_off00006378.bin
a7f4416eaa2a2af7541b64705488c64a8444479f74fca7bf8bb1f6b59b84acf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6378 5228 bytes
font_01_sfnt_off0000753a.bin
fdf7e0580361af6a3ca204e8f11388c72646b3f3b62153f643db0ccb6a5c6274
pdf-font-stream PDF embedded font (sfnt) at offset 0x753A 9972 bytes
font_02_sfnt_off0000973b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x973B 4324 bytes