Malicious PDF — malware analysis report

Static analysis result for SHA-256 457774ee4bb2a641…

MALICIOUS

PDF

47.6 KB Created: 2020-08-11 23:39:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4721a8cb7cd4348461b1202b0b6d5ac SHA-1: 264ebca5d50e2958b028bc44cceda2efa36e0438 SHA-256: 457774ee4bb2a641d11150fb8fb56746eb7a55781150a50d842ea388ceb90aee
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text that appears to be a lure for an 'algebra 2 review packet'. The presence of a link farm suggests an attempt to game search engine results to distribute malicious content. No scripts were extracted from this sample.

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=algebra+2+review+packet+pdf
    • http://files.blackhawkbrigade.com/uploads/1/3/1/4/131455198/tevuzizube_fuwimobave.pdf
    • http://files.michellewalkermusic.com/uploads/1/3/0/7/130775784/zejopibasojurof_bomimuj_wugoko_fegipuvo.pdf
    • http://files.taylordumasdesign.com/uploads/1/3/1/4/131407148/497713b4f.pdf
    • http://loxupikek.toscanointeriors.com/uploads/1/3/1/4/131407668/gefatavigima-gowejejelava.pdf
    • https://cdn.shopify.com/s/files/1/0435/4542/8122/files/nuvewideliluras.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48054684450.pdf
    • https://cdn.shopify.com/s/files/1/0431/0332/2261/files/89656283865.pdf
    • https://cdn.shopify.com/s/files/1/0438/3640/7973/files/xakerasigigixagidabesobuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4748/files/lozavafodiwobufavi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6923/5619/files/letoguvemopiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/tezemarozufenetig.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/laretodimibatugobuxugara.pdf
    • https://cdn.shopify.com/s/files/1/0444/0604/6886/files/c_create.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/dajetesubevarorivowukig.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3015/files/zusozadanojuku.pdf
    • https://cdn.shopify.com/s/files/1/0432/2322/0392/files/actuarial_science_uct.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7905/files/fonovezato.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000542b.bin
3040feaf1f635520902b48290b343a3f5f1f944a8159d64e06654f370b3651f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x542B 5192 bytes
font_01_sfnt_off00006602.bin
bd63503ce82dd252f94e4a132756a9706864cb350c35142458fe7d944be52a1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6602 10988 bytes
font_02_sfnt_off00008ba1.bin
7965500033374a49f199a3d6f7a4598505405526c83f55ccc443b910173014e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA1 16780 bytes
font_03_sfnt_off0000a31b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA31B 4324 bytes

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