Malicious PDF — malware analysis report

Static analysis result for SHA-256 87525aeac415ba19…

MALICIOUS

PDF

51.9 KB Created: 2020-08-08 21:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e223284d234a202149b7552915b19765 SHA-1: a209bb33292003359dbf524eb8be8104203f7ecd SHA-256: 87525aeac415ba19ab83aed84b462d9feaf111a5d7d03bb1a0eb29fa9937cf9a
130 Risk Score

Malware Insights

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

The PDF file contains a deceptive call-to-action disguised as a download link for 'html interview questions and answers'. This link, https://ttraff.cc/pify?keyword=html+interview+questions+and+answers+for+freshers+pdf+free+download, is identified as a malicious redirector. The document also features a large number of external links, many hosted on Shopify, which is characteristic of SEO link farm abuse to obscure malicious activity. The presence of a download button lure further supports the deceptive nature of the document.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=html+interview+questions+and+answers+for+freshers+pdf+free+download
    • http://files.missionpilgrims.com/uploads/1/3/1/3/131379456/wudizugupukilat.pdf
    • http://files.newseedspriory.org/uploads/1/3/1/4/131438708/5534735.pdf
    • http://files.whelkboy.co.uk/uploads/1/3/0/9/130969695/5657859.pdf
    • http://files.cvscpa.org/uploads/1/3/1/8/131856161/594d8bd8d25ca57.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/digalikerewuxajevukadud.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/vuwavu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/zepozawilululimidanuno.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/67298267300.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/weloloru.pdf
    • https://cdn.shopify.com/s/files/1/0428/8951/1071/files/pimifikotelekotijeg.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5288/files/tinkers_construct_github.pdf
    • https://cdn.shopify.com/s/files/1/0428/7175/0823/files/xulivizimutepuduwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5174/files/89118270028.pdf
    • https://cdn.shopify.com/s/files/1/0434/2562/8327/files/noto_sans_symbols_error.pdf
    • https://cdn.shopify.com/s/files/1/0432/2577/6288/files/matura_angielski_wiczenia_leksykalno_gramatyczne.pdf
    • https://cdn.shopify.com/s/files/1/0431/5830/6965/files/11943166482.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_off00006942.bin
c95513732daa1e43f21e088d1ba95fa670129e7fea92553c12a2a2c102382cab
pdf-font-stream PDF embedded font (sfnt) at offset 0x6942 5520 bytes
font_01_sfnt_off00007be4.bin
74e32a10093b1c5a8864a911daf90d9f58079117373a2bb40d786986f7571f19
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE4 7592 bytes
font_02_sfnt_off000094c9.bin
8511aa4c7752ce79a2c8b099b16d55383b7fee0725f19509d4157ba24891bdee
pdf-font-stream PDF embedded font (sfnt) at offset 0x94C9 14492 bytes