Malicious PDF — malware analysis report

Static analysis result for SHA-256 927b2b503f230163…

MALICIOUS

PDF

41.4 KB Created: 2020-08-06 14:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e133bdf9c509734768394b5846f7dd3f SHA-1: 4084ffaa67cb76e34746a723b81a722a5db81909 SHA-256: 927b2b503f230163bc14b75b700a2f700fbd91b3a4ac4a481e1f7e8da4b8bd77
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to lure users with promises of downloadable books, such as 'basic english learning book pdf download'. The primary malicious URL, https://ttraff.com/pify?keyword=basic+english+learning+book+pdf+download, acts as a redirector to further malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a malicious redirector.

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=basic+english+learning+book+pdf+download
    • http://lijenab.fwcmobridge.com/uploads/1/3/1/4/131407406/9236040.pdf
    • http://files.bubba-and-friends.org/uploads/1/3/0/7/130776304/xopinoxar_sitemik.pdf
    • http://files.oneburgh.com/uploads/1/3/0/7/130739265/3427674.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vijob.pdf
    • https://cdn.shopify.com/s/files/1/0429/8683/2035/files/27258958324.pdf
    • https://cdn.shopify.com/s/files/1/0437/2607/8101/files/83066431646.pdf
    • https://cdn.shopify.com/s/files/1/0435/7108/5475/files/70655533872.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4395/files/majonevosinufanujuvese.pdf
    • https://cdn.shopify.com/s/files/1/0430/8857/6661/files/adobe_cc_cleaner_tool.pdf
    • https://cdn.shopify.com/s/files/1/0431/2950/3908/files/wuvunujagafakuvoxonufi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3545/9738/files/japanese_rosetta_stone_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/51813578307.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/attendance_certificate_format_for_school_students.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49893706483.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3439/files/tuvizojivamogoxoxulipa.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/58612960456.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/56215770795.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_off00006297.bin
e49308d4ba0d33ac42f5a95db26ddc5a175ce581f50e8960482810f38fa6f066		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6297 5760 bytes
font_01_sfnt_off00007635.bin
3111af44de00986414c39df0abd3a73c2b124821962d17d88de44dead63fb863		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7635 9996 bytes

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