Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6078fb87ebe78a…

MALICIOUS

PDF

37.5 KB Created: 2020-08-12 05:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7970ded7563b07409e4916078e49800 SHA-1: db10b110a1c6800ddbb9e08e80de4ee3aba3f630 SHA-256: aa6078fb87ebe78a1ec15f4f99c725f6256033e68122fa954f2cd31e59ec468e
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a large number of embedded links, with at least one pointing to a known malicious redirector. The document body itself is heavily obfuscated but contains the malicious URL. This suggests the primary purpose is to lure users into clicking malicious links, likely for phishing or malware distribution.

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.ru/pify?keyword=schindler+s+list+theme+cello+pdf
    • http://files.newrichmondwiumc.org/uploads/1/3/2/3/132303226/burarifigaleba.pdf
    • http://gawuxadef.ppitowing.net/uploads/1/3/1/6/131637339/093ec766d5d86.pdf
    • http://gejikuk.brookwoodlearning.com/uploads/1/3/1/4/131454012/jamipopetofer_xizir_wivofipet.pdf
    • http://files.txagriwomen.com/uploads/1/3/0/9/130969469/vabonaw.pdf
    • http://files.riverqueengreens.com/uploads/1/3/0/7/130775320/wakumasawewasol.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/marakidulitadegubozo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9789/1751/files/dakenavumejulusudot.pdf
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/sitekosaduxewu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9954/4984/files/duvolumizaxudalimoxogoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/babape.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/baxidofinafe.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/milodaporugorupofaxuju.pdf
    • https://cdn.shopify.com/s/files/1/0435/8488/0798/files/wow_classic_raptor_egg.pdf
    • https://cdn.shopify.com/s/files/1/0436/0758/9027/files/sobemuxogukexigupige.pdf
    • https://cdn.shopify.com/s/files/1/0448/1312/3744/files/basic_guitar_chords_chart_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/ludatefawolafe.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_off00004843.bin
66b1415428a394010fb1c31c9dd7ba02956804693e5257378568d91dc2b02884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4843 5076 bytes
font_01_sfnt_off0000593f.bin
bf8cd1021b4ad10895fa92d89102b96ab4c0c108aff482d856fd8d4ec08f853f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x593F 9832 bytes
font_02_sfnt_off00007aed.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AED 4324 bytes

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