Malicious PDF — malware analysis report

Static analysis result for SHA-256 674b8943fee4e5c9…

MALICIOUS

PDF

46.2 KB Created: 2020-08-06 11:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92f6199c61b1ab2645bf4b54f9a44943 SHA-1: 8dcf247df40b87fc56637b639bb3f94436ba75c1 SHA-256: 674b8943fee4e5c95e0b7071cd075d1437d2f6205fed07cef932e94305e573e1
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.ru, which is likely used to funnel victims to further malicious content. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to marriage advice. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to increase visibility of the malicious content.

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=69+things+i+wish+i+knew+before+getting+married+pdf
    • http://files.wppsfete.com.au/uploads/1/3/2/6/132695428/nixumununonok.pdf
    • http://files.tunisian-tile-stone.com/uploads/1/3/1/6/131637014/nanarobiwi.pdf
    • http://files.roadclawtyres.com/uploads/1/3/1/3/131384718/23de45e4e653cba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2574/3515/files/139946979.pdf
    • https://cdn.shopify.com/s/files/1/0430/8752/8103/files/bikadatuxujije.pdf
    • https://cdn.shopify.com/s/files/1/0433/8273/5006/files/26144928610.pdf
    • https://cdn.shopify.com/s/files/1/0433/3246/8890/files/6317194129.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/tafebazuteparemudax.pdf
    • https://cdn.shopify.com/s/files/1/0432/7420/7387/files/niwidurut.pdf
    • https://cdn.shopify.com/s/files/1/0434/8752/7078/files/50552203333.pdf
    • https://cdn.shopify.com/s/files/1/0435/6145/1681/files/surge_arrester_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/maury_lie_detector_meme.pdf
    • https://cdn.shopify.com/s/files/1/0431/4896/8090/files/digudiruxabepedo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0617/3081/files/terminal_commands_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/36000636984.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_off000073d2.bin
38ed8defb3b01dcf933ae229f7fe89c8dcec1e987d497e6e0e78686b6dd9033f
pdf-font-stream PDF embedded font (sfnt) at offset 0x73D2 5932 bytes
font_01_sfnt_off000087e5.bin
d9b08ff9ab9bd277753ee5438ef13f550f6407684ad8916ff86a1443c7ce305a
pdf-font-stream PDF embedded font (sfnt) at offset 0x87E5 10532 bytes