Malicious PDF — malware analysis report

Static analysis result for SHA-256 614b745889453b28…

MALICIOUS

PDF

41.1 KB Created: 2020-08-24 20:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4abd33304012caf45111229943181f2 SHA-1: 6df63dc435e1e52b9833293b5080e9b08218a7c8 SHA-256: 614b745889453b287295b856dd597da79cdfd6f0d6741222a4d4da46027aeac8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. It also features a large number of external PDF links, suggesting a link farm or a distribution mechanism for further malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to malicious sites.

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=13757+cerfa+02+pdf
    • http://files.sissonvillechurchofchrist.org/uploads/1/3/1/3/131379249/wadufubugepafe.pdf
    • http://fuxitadur.blackwolfknives.net/uploads/1/3/0/7/130739192/9ba6f.pdf
    • http://files.alternativeboomerlegacy.com/uploads/1/3/2/8/132815015/lofulapulavujez-ziwokiwo-zozagapirel.pdf
    • http://files.g-publica.com/uploads/1/3/0/7/130776536/xexapaju.pdf
    • http://lasixuti.schoolrockspartybox.org/uploads/1/3/2/7/132712324/a38b332c9ba035.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0582/9532/files/xomovepasekaguwuda.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/film_bioskop_indonesia_posesif_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/99995462048.pdf
    • https://cdn.shopify.com/s/files/1/0434/4463/3750/files/15628579418.pdf
    • https://cdn.shopify.com/s/files/1/0438/3752/2080/files/arthashastra_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0437/0723/6503/files/92731478747.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0209/files/difference_between_restricted_earth_fault_and_differential_protection.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/flocabulary_8th_grade_unit_5_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/9928/2845/files/husqvarna_chainsaw_bar_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/1729/0407/files/basexojalo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/87829520019.pdf
    • https://cdn.shopify.com/s/files/1/0430/8572/5857/files/kidudaxazamubazetus.pdf
    • https://cdn.shopify.com/s/files/1/0437/7542/6721/files/dependent_prepositions.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e2f.bin
17eedcf62047d10e0f55e151163d5a9bb150e8e47713938debedd2abcb6a70dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2F 5536 bytes
font_01_sfnt_off00007115.bin
c51703535e303a19d332538e220f52eabcadbf2dd3cd00dc24c74620be3730ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7115 11888 bytes

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