Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9022db848145ed…

MALICIOUS

PDF

54.0 KB Created: 2020-08-08 05:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bd8853e475d191cbd8376721c262140 SHA-1: edbda8d634780212e4fc09d3120cf1a1f9dc49e2 SHA-256: ab9022db848145ed7bd3564cf19db7d556480ad1e2dd3f2bd5bb71159012f525
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.ru'. The document body, though partially corrupted, suggests a lure related to 'list of irregular adjectives in english pdf'. The ML classifier strongly flagged this PDF as malicious, and heuristic rules confirm the presence of malicious redirector links and a link farm, indicating a probable phishing or malware distribution attempt.

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=list+of+irregular+adjectives+in+english+pdf
    • http://files.12amphotography.com/uploads/1/3/0/9/130969724/6955488.pdf
    • http://bopotu.embeddedresearch.org/uploads/1/3/1/3/131380429/9741046.pdf
    • http://files.pdxprays.com/uploads/1/3/1/3/131383018/wikixawasagi.pdf
    • http://bopotu.embeddedresearch.org/uploads/1/3/1/3/131380429/974
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rowogumidakedodovejizana.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8053/files/duzavisotubodenuzoboruwur.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/40961193866.pdf
    • https://cdn.shopify.com/s/files/1/0437/5199/7592/files/25544527563.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/cambridge_english_grammar_check_your_vocabulary_for_ielts.pdf
    • https://cdn.shopify.com/s/files/1/0435/1072/6815/files/fanat.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7800/files/kojiwijoradu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/bugopavi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6315/files/xenezazisajawi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/jadizomoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/3640/0037/files/wubuwutigidetujolivup.pdf
    • https://cdn.shopify.com/s/files/1/0447/9886/9653/files/antiphospholipid_syndrome_nejm.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1123/files/kewaketorimafeg.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_off0000805d.bin
de445a4b488328cb72dd8e8253a51c7533bbe361f9e959862ebe0ceb1c37cdc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x805D 5376 bytes
font_01_sfnt_off000092a3.bin
4f2a9571a74a1d14dd844759908f8605ff8e4db3564566d89feed1029a147711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92A3 13124 bytes
font_02_sfnt_off0000bbfd.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFD 4324 bytes

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