Malicious PDF — malware analysis report

Static analysis result for SHA-256 7480e0757efe432f…

MALICIOUS

PDF

32.8 KB Created: 2020-08-11 15:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bce04092b8b5158ac05247a88bfce73 SHA-1: 9ceaf6c18ff0a2f34edae86940917c020e133788 SHA-256: 7480e0757efe432f23b34f6cc4bea9580cee92b6629e0d9aada50560506a190a
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including a critical malicious redirector link to ttraff.com and a link farm of 15 external PDF links. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=libro+el+cerebrito+pdf', suggesting a lure to a specific topic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=libro+el+cerebrito+pdf
    • http://files.specialtouchesgiftsforthehome.com/uploads/1/3/2/6/132681602/fumad_tilazenu.pdf
    • http://files.weinbergfirm.com/uploads/1/3/1/4/131483149/xusex.pdf
    • http://kunuze.franklindevelopmentcorporation.org/uploads/1/3/1/4/131408280/1274611.pdf
    • http://files.roselawvermont.com/uploads/1/3/1/4/131407227/170f1320375662.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4216/8218/files/approximation_for_bank_exam.pdf
    • https://cdn.shopify.com/s/files/1/0434/2962/6013/files/20461915346.pdf
    • https://cdn.shopify.com/s/files/1/0439/1976/9755/files/strago_lore_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/86789278161.pdf
    • https://cdn.shopify.com/s/files/1/0430/4430/7098/files/aoac_1990_volume_2.pdf
    • https://cdn.shopify.com/s/files/1/0427/7927/9527/files/moxulitijizupub.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0987/files/63040067338.pdf
    • https://cdn.shopify.com/s/files/1/0434/4463/3750/files/azur_lane_wiki.pdf
    • https://cdn.shopify.com/s/files/1/0429/4275/9071/files/bojuvo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0314/0506/files/curious_incident_of_the_dog_in_the_nighttime_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1068/files/810_735_3481.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_off00004396.bin
3c0936d32b2933d0d2a3855af93a0aa4a0f933b5fd367b555ce45fedc3377b47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4396 4840 bytes
font_01_sfnt_off00005413.bin
0fdd4ad9c487d9ffbbc0d2b61f6cbe5d0819c2ef87a092d46d8e297a6e716b27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5413 10124 bytes

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