Malicious PDF — malware analysis report

Static analysis result for SHA-256 138b036b605d017f…

MALICIOUS

PDF

41.4 KB Created: 2020-08-30 10:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75500eccdce3b08d5fddc2d6c9e11e51 SHA-1: 35f1a5f188d8e75cd9d84ab91be63f6be818ccaf SHA-256: 138b036b605d017fc4b99314058d73ab77a97ae39390ebc4bf6c4e04aeeba174
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, which is likely used to obscure the final destination of the malicious payload. The document body and embedded links suggest a lure to download further content, potentially leading to malware execution. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=morir+para+ser+yo+pdf+descargar
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9886/4804/files/dirasogiponiwetaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4255/files/aide_mmoire_tuyauterie.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1642/files/chattanooga_choo_choo_piano_sheet_music.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b5bb4c34d544e77a873316ca3b9b10f.pdf
    • https://static.usrfiles.com/ugd/b8c837_3516c67845fd40e2adecda447aa46ce6.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4d71394db514285b0e877aaeb746780.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8e54e194d38428eb80a7ec448b64d0a.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28821374719.pdf
    • https://cdn.shopify.com/s/files/1/0459/9401/6935/files/dowaxoregedejemezobu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/xagemafibozeguxisezilur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21533622499.pdf
    • https://cdn.shopify.com/s/files/1/0427/5326/1724/files/93377212117.pdf
    • https://cdn.shopify.com/s/files/1/0431/7433/0517/files/kijugosukudebexilatukaden.pdf
    • https://cdn.shopify.com/s/files/1/0432/3295/2477/files/33609705608.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_off00005f8b.bin
ff19a7d9f7b317351ca90450a7360cd1d9025de7540ab682709a8279145c9101
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8B 5396 bytes
font_01_sfnt_off00007206.bin
df1087f5f3282844a7cfb2dc8af70bc5bea2b063691252aaa03099569b2dcdfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7206 11376 bytes