Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71ec7f55c0363b0…

MALICIOUS

PDF

50.0 KB Created: 2020-08-07 13:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0a8f5b5c1c9cdacbb81e730d327517f SHA-1: 78a2dd5b9887e168faf153558a3f73d58f4fb66c SHA-256: e71ec7f55c0363b0330e6a13d9d6a51e42678ad2759956f8428d23d4ecb25d7d
150 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.cc/pify?keyword=akuntansi+pajak+atas+piutang+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is related to tax accounting, which is likely a lure. The presence of numerous external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content. The ML classifier strongly supports the malicious verdict.

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=akuntansi+pajak+atas+piutang+pdf
    • http://files.stitchstand.com/uploads/1/3/0/7/130775567/rojukovekokas.pdf
    • http://files.loneforestwolfphotography.com/uploads/1/3/0/7/130776486/weloritofikuke.pdf
    • http://files.livarnold.com/uploads/1/3/0/7/130776150/8035510.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gobobuxewinunegurugita.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9560/files/vozojasusejadamo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6958/8124/files/apush_chapter_3_test.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/mechanical_engineering_interview_questions_and_answers_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3487/7847/files/21051877299.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/mewadaluwuda.pdf
    • https://cdn.shopify.com/s/files/1/0429/6825/2565/files/28290229543.pdf
    • https://cdn.shopify.com/s/files/1/0440/7944/8216/files/adobe_acrobat_reader_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/8600/2838/files/73598594445.pdf
    • https://cdn.shopify.com/s/files/1/0428/7542/0835/files/forasopijafonotobojak.pdf
    • https://cdn.shopify.com/s/files/1/0430/6491/8165/files/61250761914.pdf
    • https://cdn.shopify.com/s/files/1/0429/2087/0044/files/77804134147.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3084/files/95008483373.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_off000084f0.bin
af3033e59e4832615700011474aebccfcda52c505b2981df36d4329632882525
pdf-font-stream PDF embedded font (sfnt) at offset 0x84F0 5212 bytes
font_01_sfnt_off000096cd.bin
337d5076ce7ec4bbec93f2c4ae9a8949a8db53fb8ab2ae7179dbf5c5e33c8f4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x96CD 10516 bytes