Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb71c2c16797607d…

MALICIOUS

PDF

52.8 KB Created: 2020-08-17 03:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e5f2efe4639fd0f31fc79f63b12b05a SHA-1: 79c249cdaa928c8d8e0952ae4a6ff4149e7a9f1f SHA-256: bb71c2c16797607d1eb8d0cffdadd5ed90e6258a2d235ad4bfdc167d8e9a75ad
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=backend+interview+questions+and+answers+for+freshers', which is also listed as a malicious redirector. This suggests the document is designed to trick users into clicking malicious links under the guise of providing interview resources.

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=backend+interview+questions+and+answers+for+freshers
    • http://files.observationsandconclusions.com/uploads/1/3/1/1/131164424/499063.pdf
    • http://dabowa.creedpaintings.com/uploads/1/3/1/6/131606069/niwitika.pdf
    • http://files.thedevilsdispatch.com/uploads/1/3/1/4/131453823/2832597.pdf
    • http://files.st-theresa-earlville.com/uploads/1/3/1/0/131070009/3379570.pdf
    • http://rulawosen.ims-university.com/uploads/1/3/1/3/131384635/6199279.pdf
    • https://cdn.shopify.com/s/files/1/0432/7188/0870/files/xubidatojefumupadetomefo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9874/3719/files/88884325719.pdf
    • https://cdn.shopify.com/s/files/1/0431/0482/9589/files/zokekesogej.pdf
    • https://cdn.shopify.com/s/files/1/0437/0333/7114/files/barodakimavupegiju.pdf
    • https://cdn.shopify.com/s/files/1/0437/6179/5230/files/antas_ng_komunikasyon.pdf
    • https://cdn.shopify.com/s/files/1/0430/6426/2818/files/lelabanote.pdf
    • https://cdn.shopify.com/s/files/1/0431/1495/4918/files/gateway_b1_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/38791511017.pdf
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/rpsc_steno_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0440/1197/8902/files/brand_image_vs_brand_identity.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_off00008fd0.bin
aaba98fe357f86934ff7aea089b4a4ea269258a6b2518a527534633519775c49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD0 5468 bytes
font_01_sfnt_off0000a277.bin
61e0bc32cd3afd8d18478968619d0ddd181a39d30e85c5283828434098216201		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA277 10388 bytes

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