Malicious PDF — malware analysis report

Static analysis result for SHA-256 c421478d578d6a96…

MALICIOUS

PDF

46.2 KB Created: 2020-08-12 18:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4721d659bda34755bf27ff529d70232 SHA-1: 5939e6bfafeadc5f2e1e8312acf52df0fa7df3e9 SHA-256: c421478d578d6a969bfb2d7823335b05c5cdb597f237be8cca7ba462597e5dd8
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary redirector pointing to a known malicious URL. The heuristic firings indicate this PDF is a malicious redirector and part of a link farm, likely designed to lure users to malicious sites through deceptive search engine results. The ML classifier strongly supports the malicious nature of this PDF.

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=vapour+absorption+cooling+system+pdf
    • http://kogifewa.aeesei.com/uploads/1/3/1/0/131070571/badabezuwufuw_bedixubeviwonam_nokudagave_falipugesuvulo.pdf
    • http://files.reelectjudgetabbey.com/uploads/1/3/2/7/132712163/14257bb2cf4ed.pdf
    • http://femur.portraitreflections.net/uploads/1/3/1/0/131069839/dedejaboxemezek.pdf
    • http://files.trutattoo.com/uploads/1/3/1/4/131437531/niwowom.pdf
    • http://files.neo-hawaii.com/uploads/1/3/0/7/130775649/duzefafodizo-poxikero-lurumunu-runonurujefu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23631451812.pdf
    • https://cdn.shopify.com/s/files/1/0440/8590/3525/files/dell_keyboard_kb212-_b.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0728/files/xifapukamuliminirub.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/38023362419.pdf
    • https://cdn.shopify.com/s/files/1/0434/3480/3352/files/jigejiduvemokopafus.pdf
    • https://cdn.shopify.com/s/files/1/0432/0346/1283/files/newolixoxagesizesibo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/noreviraviwowilipanavef.pdf
    • https://cdn.shopify.com/s/files/1/0434/6452/3926/files/non_budgetary_control.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3128/files/88553470516.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/48799613715.pdf
    • https://cdn.shopify.com/s/files/1/0435/2635/7152/files/the_tale_of_the_dueling_neurosurgeons.pdf
    • https://cdn.shopify.com/s/files/1/0433/6500/7509/files/12114404953.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/norfolk_southern_hiring_process.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3304/files/finenufupepawobikix.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_off0000756f.bin
90ebb8e32da809a606312a46b280e0cf2b21290277d8db4a1ff4d67067621339
pdf-font-stream PDF embedded font (sfnt) at offset 0x756F 5684 bytes
font_01_sfnt_off000088ad.bin
bf2ac31e7ef35266a4f86441898bc7206df48c366d93b63730ec4f0c0b34c85f
pdf-font-stream PDF embedded font (sfnt) at offset 0x88AD 10340 bytes