Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5f6f13780b8577…

MALICIOUS

PDF

45.8 KB Created: 2020-08-14 18:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ae314608b8c644b157db7b606b15b4e SHA-1: 35a64597d8d2cfdb6c45ee32bfc3f2e5018c96fd SHA-256: 6a5f6f13780b8577e68bff8805aeae7b6e2347d4d3b505f7928125d937d98695
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM. One of the primary URLs, `https://ttraff.com/pify?keyword=jsp+number+format+decimal`, is flagged as malicious. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious sites. The ML classifier strongly supports the malicious verdict.

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=jsp+number+format+decimal
    • http://kesamiti.bulbsoup.com/uploads/1/3/0/8/130813054/6539618.pdf
    • http://files.kobanuniverse.net/uploads/1/3/1/3/131381374/tajorez.pdf
    • http://files.twincreekgoldens.com/uploads/1/3/1/4/131453559/d47732d32.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/convert_bin_cue_to_iso.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovaje.pdf
    • https://cdn.shopify.com/s/files/1/0429/7595/3049/files/99911738003.pdf
    • https://cdn.shopify.com/s/files/1/0433/6523/6886/files/the_norton_anthology_of_short_fiction_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/top_100_worship_songs_lyrics_and_chords.pdf
    • https://cdn.shopify.com/s/files/1/0428/8629/9815/files/central_asia_travel_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/1384/6693/files/zulonolasaguxoxukir.pdf
    • https://cdn.shopify.com/s/files/1/0450/6845/1992/files/x5_bluetooth_car_kit_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0947/files/amadeus_script.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/70558785759.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d63.bin
0f39b924d164b50b4a46f241ee119065a42ae602b424870a60b3fe8d646ecb54
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D63 3548 bytes
font_01_sfnt_off000069fb.bin
3b1ed29eef08d6badf5e5ed85a755cdd2dc167a8a541a1ae93be8eb2e636c131
pdf-font-stream PDF embedded font (sfnt) at offset 0x69FB 5432 bytes
font_02_sfnt_off00007c48.bin
ed9db06ef50afb3fc82f8b810939c9897382886bdbf0f41536800fe37c7cd118
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C48 14696 bytes