Malicious PDF — malware analysis report

Static analysis result for SHA-256 221a75a46a6e6ca0…

MALICIOUS

PDF

59.7 KB Created: 2020-08-08 21:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5f204c572004cc118a509d2d8dda7b6 SHA-1: da4da62e69a1863f197b695993b282c5719bc7c4 SHA-256: 221a75a46a6e6ca08767c2e62387b5b03fb763b1451fd53704b9f13aba3efacf
150 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and 'PDF_SEO_LINK_FARM' indicates a large number of external links, many hosted on Shopify, suggesting an attempt to disguise malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that is also flagged as malicious.

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.com/pify?keyword=ciencias+sociales+8+pdf
    • http://files.aretemediaacademy.com/uploads/1/3/1/0/131070581/2141031.pdf
    • http://files.kimjones.org/uploads/1/3/0/7/130775221/1984811.pdf
    • http://files.flowersfromthedead.com/uploads/1/3/1/4/131437005/mutuwafefatobe-nixebopim.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/15557246336.pdf
    • https://cdn.shopify.com/s/files/1/0430/8657/7828/files/53766501104.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/50993528164.pdf
    • https://cdn.shopify.com/s/files/1/0429/2296/7207/files/modern_control_engineering_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8516/files/48278824946.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/just_the_facts_earth_and_space_science.pdf
    • https://cdn.shopify.com/s/files/1/0436/8531/4715/files/gejemosapawabixuvufimoja.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/fun_math_games.pdf
    • https://cdn.shopify.com/s/files/1/0433/5314/5495/files/92783496099.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0738/files/sukodabafo.pdf
    • https://cdn.shopify.com/s/files/1/0440/1607/4902/files/20414961499.pdf
    • https://cdn.shopify.com/s/files/1/0433/5602/9093/files/90847075222.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5755/files/41186685090.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_off00009de5.bin
16b28712977576c6e948fd4f3c879190288eeb7bb3e3d00f3f2ee639473a13f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x9DE5 4976 bytes
font_01_sfnt_off0000aed2.bin
1fb78a4e19762195e46ea6ed07c70155fa5d6ea0d6a6653d27cc79c9675a46bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xAED2 10864 bytes
font_02_sfnt_off0000d24e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 4324 bytes