Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b1acdfbfff06fc…

MALICIOUS

PDF

50.0 KB Created: 2020-08-05 12:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16976db5a24acf724277247434d437b5 SHA-1: 1b0813d979f397b88f96c1bec4d04c36571d82e0 SHA-256: 27b1acdfbfff06fc0851ebf70e441171271729d26f5654a4d03713d49173e202
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure for a free textbook download. The presence of a link farm and a malicious redirector indicates an attempt to drive traffic to potentially harmful sites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=alagappan+5th+edition+pdf+free+download
    • http://files.whiteoakestateandgardens.com/uploads/1/3/1/3/131398362/kovagubebuf-tisitemanamom-vetelifopad-fiwivumilup.pdf
    • http://files.restoring-balance.com/uploads/1/3/1/4/131407705/kulofowozujiro-piditosut.pdf
    • http://files.completelydamaged.net/uploads/1/3/2/7/132712006/30a629f.pdf
    • http://files.nickelcityaussies.com/uploads/1/3/1/0/131070912/f52f51.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4220/files/aldehydes_and_ketones_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0433/0363/3051/files/bodefuduvizusekoko.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/44440023431.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kikurum.pdf
    • https://cdn.shopify.com/s/files/1/0435/5024/5028/files/71133525726.pdf
    • https://cdn.shopify.com/s/files/1/0446/4757/9811/files/absalom_absalom_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/8548/8543/files/getigudukogatu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4718/8640/files/zibijutalunefolenuxukafo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7501/files/31231117362.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/rixomurujudalubotuforene.pdf
    • https://cdn.shopify.com/s/files/1/0432/2702/1480/files/fekimitonumag.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_off0000780b.bin
1913fd3ff75d569234c81f49a3cc7b8591ebfa97279d6a2be894054929ae70b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x780B 5120 bytes
font_01_sfnt_off0000897a.bin
921dfa6b644dbc5f0bb4afdd77526292c0994a8b1a85c51aee77bf56b46bf3ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x897A 10272 bytes
font_02_sfnt_off0000ac97.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC97 4324 bytes

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