Malicious PDF — malware analysis report

Static analysis result for SHA-256 db34f38a2da618e3…

MALICIOUS

PDF

75.1 KB Created: 2020-07-31 12:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 333de0fa543da2f382781be288fafcda SHA-1: 40e6f47f672d7a7010bb9bbc39a83ca94bb55416 SHA-256: db34f38a2da618e3f1a12466827cde9580016ce68ba7511422d8cd43584fec4d
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text related to 'area of circle proof pdf', likely a lure. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to improve SEO for malicious content. 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.com/pify?keyword=area+of+circle+proof+pdf
    • http://files.flocrowcroft.co.uk/uploads/1/3/0/8/130814346/11e77c7.pdf
    • http://files.synodalcatholicsse.org/uploads/1/3/1/4/131452953/xuxig.pdf
    • http://files.cozykidsembroidery.com/uploads/1/3/1/4/131409170/ninebafakafekip.pdf
    • http://files.chikuniradiozm.org/uploads/1/3/0/7/130739991/gixinetuwuk-beruwidopax.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/golasabigizejusudavijitu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/purubidejurupefedu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0304/4263/files/fagutonaxovirusajusasunu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1142/files/wixijowisakavivevap.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84574839703.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/lepowoka.pdf
    • https://cdn.shopify.com/s/files/1/0432/1129/2829/files/tejemazaxadevudofub.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6322/files/renerabirawupaxunuse.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/jenosubesar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9072/3487/files/jabimolujebit.pdf
    • https://cdn.shopify.com/s/files/1/0432/9239/3640/files/juremanijexodijo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9070/6589/files/70058471689.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/belujigapuwotuxus.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_off0000c370.bin
9933763c274951b3b823ec069487ea1feb6dddb25ed55c547489005933c44009		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC370 4560 bytes
font_01_sfnt_off0000d2fa.bin
9d078c97c665844497d39fe41853f7156f2075e860890bcf4104ec36905d7cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FA 16504 bytes
font_02_sfnt_off000106ad.bin
b8a2e53040bcab2b98db4c9f842eed0ae66586d7fbe41681925ba7ed377ef4a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106AD 16448 bytes

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