Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a78712415055f7…

MALICIOUS

PDF

59.5 KB Created: 2020-08-22 18:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0510b54c908debdeaf41e4b0ec584f87 SHA-1: 7094d1030255723dd6208dc53a30fa0a4108c95d SHA-256: a8a78712415055f73ee76b61f9d9fb34abeb562c7ae4357fe6ae84ac465080a4
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=tamil+typing+guide+pdf'. This indicates the document is designed to lure users into clicking a link that leads to malicious infrastructure. The presence of a large number of external PDF links, many hosted on shopify.com, suggests a link farm or SEO poisoning tactic to distribute the malicious content. No scripts were extracted, but the primary attack vector is the embedded malicious URL.

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=tamil+typing+guide+pdf
    • http://dixiz.duniaamir.com/uploads/1/3/1/4/131438019/kavibilazefi.pdf
    • http://files.balanceandneurologic.com/uploads/1/3/1/4/131437680/9396602.pdf
    • https://cdn.shopify.com/s/files/1/0438/0209/9873/files/74446996053.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/jenusaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5567/6568/files/12036446461.pdf
    • https://cdn.shopify.com/s/files/1/0437/8981/1861/files/bhagam_bhag_song_video.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/zafigoxujugeke.pdf
    • https://cdn.shopify.com/s/files/1/0430/3798/2869/files/zutebapuxebome.pdf
    • https://cdn.shopify.com/s/files/1/0435/9749/6488/files/cambridge_primary_english_stage_5_teacher_s_resource.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/ts_file_to_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pujofupokutesigitugut.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/atrocity_act_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0434/7432/1560/files/rujiwebujadekegikivube.pdf
    • https://cdn.shopify.com/s/files/1/0435/1678/8900/files/vexiraxijopis.pdf
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/33713828147.pdf
    • https://cdn.shopify.com/s/files/1/0432/4317/6091/files/tekonale.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7300/files/41792980821.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
stream_005_off000085d6.bin
c0a4e957aeb520b6c324bde5860311fae4a130da143b84182a4cd4d420461b99
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x85D6 27452 bytes
font_00_sfnt_off00007462.bin
2799d6b2d911720f7e9f146d18ac35f686f9719ffe0b5698234433b4ecd3fc74
pdf-font-stream PDF embedded font (sfnt) at offset 0x7462 5140 bytes
font_02_sfnt_off0000bab7.bin
7a0b25c3bbf5a9a33f47878591eea49577d20af53ed021daba4b59799d955c95
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB7 10600 bytes