Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d58525c27c2ccad…

MALICIOUS

PDF

34.2 KB Created: 2020-08-14 21:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d81bc6e859fc9332b11725db1c15cb1c SHA-1: a960aed597d6af2e40ed4d17e8a2fac2dcec72a1 SHA-256: 2d58525c27c2ccade513ed9a368026a4d3bf2e764e8ed2f0e82d49017e5ca67f
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to deliver a secondary payload. The document body, though malformed, contains text suggesting it is a worksheet, a common lure for phishing or malware delivery. The heuristic firings strongly indicate malicious intent, with the ML classifier outputting a near-certain malicious score. The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm for SEO poisoning or to obscure the ultimate destination.

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.cc/wb?keyword=parallel%20lines%20and%20angles%20worksheet%20doc
    • http://files.mayettafire.com/uploads/1/3/1/8/131857465/mozipodi-wekaruraviz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6862/8890/files/88342602189.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1143/files/66506975240.pdf
    • https://cdn.shopify.com/s/files/1/0435/7927/7467/files/katoruzotataxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5958/files/assessment_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/7996/6628/files/pulalezafupilimuban.pdf
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/scrambled_sentences_present_simple.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/suzotewudopuremujemu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/bomberman_b-_daman_bakugaiden.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/posoriwifokewibig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/winoxilerudizixadejugo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4023/4917/files/1_99_magic_guide.pdf
    • https://cdn.shopify.com/s/files/1/0454/6166/7992/files/82377448822.pdf
    • https://cdn.shopify.com/s/files/1/0432/5959/2859/files/fuvemezazanakimomofaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/captivated_by_you_sylvia_day_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000469d.bin
bfbebf85a7a2fcb917580a333ed15e620e01d470aa41563ce60ab3dd81fc3c5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x469D 5360 bytes
font_01_sfnt_off000058d5.bin
fcca5c07b1186e0091bd423240a4949ac1bd28921bd4883fa324374132b157fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D5 9780 bytes

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