Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df48cd7fff15b6f…

MALICIOUS

PDF

47.4 KB Created: 2020-08-24 09:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aba06720ff06a0099069694c663ff1e2 SHA-1: b9d18e82570927af603c7d063ed428718253190f SHA-256: 8df48cd7fff15b6fa85866615e3588e1eb7a57b3c3e0ed534fb235f38bdc9df8
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=os+booting+software'. This indicates the document's primary purpose is to lure the user to a malicious site. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to improve search engine visibility for malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded malicious URL is sufficient evidence for the attack pattern.

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=os+booting+software
    • http://files.kalbproject.com/uploads/1/3/1/8/131871390/vuzexevonovigam.pdf
    • http://files.workpurposefully.org/uploads/1/3/0/7/130776125/416637.pdf
    • https://cdn.shopify.com/s/files/1/0460/7973/8020/files/lamprell_annual_report_2016.pdf
    • https://cdn.shopify.com/s/files/1/0432/9105/0137/files/51089796848.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/zunezexavebokegiwe.pdf
    • https://cdn.shopify.com/s/files/1/0437/8787/8549/files/71040550049.pdf
    • https://cdn.shopify.com/s/files/1/0437/8951/6958/files/casio_g_shock_ga_110_1ber_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/3536/8346/files/machine_learning_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0445/3544/7711/files/technical_analysis_for_dummies_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/3018/4098/files/nenojajuratukole.pdf
    • https://cdn.shopify.com/s/files/1/0451/0426/7427/files/el_evangelio_apcrifo_de_judas.pdf
    • https://cdn.shopify.com/s/files/1/0428/1987/9079/files/98999140406.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/jefibudis.pdf
    • https://cdn.shopify.com/s/files/1/0433/9482/6396/files/ascii_code_table_binary.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_off00007bfe.bin
06baf9aede16957d1f11589c4bcb4a154397fbd3dc3dff9f1924b61935dd7d15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BFE 5160 bytes
font_01_sfnt_off00008da3.bin
026a92ba63969944fe692a4e020ec632729b786db410722a07ba8a614bff1e0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA3 10400 bytes

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