Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6dc76438a93503…

MALICIOUS

PDF

35.1 KB Created: 2020-08-28 12:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37f7dd63461e327e9401b86966c626eb SHA-1: 073873df428f479dc0f6224ab0b956bac684d1b5 SHA-256: 5a6dc76438a93503ad98bb7da6bf990a31cbed861081d0a18ae834bcaf2200fb
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a link farm designed to host numerous PDFs. The primary malicious link identified is https://ttraff.com/pify?keyword=the+power+of+broke+free+download, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the same malicious URL, suggesting a lure for free downloads that leads to 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.com/pify?keyword=the+power+of+broke+free+download
    • http://files.clarencelam.com/uploads/1/3/1/4/131484328/1908241.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6847/9893/files/vocabulary_list_for_3rd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0431/6197/6994/files/64134107083.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/contour_storyteller_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/1162/1543/files/destroy_all_humans_ps2_iso.pdf
    • https://cdn.shopify.com/s/files/1/0437/2011/4331/files/megagebowuxosezanubakud.pdf
    • https://cdn.shopify.com/s/files/1/0432/7797/5717/files/anamorphic_format_app_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/7978/5891/files/quick_heal_secure_browser_free_2018.pdf
    • https://cdn.shopify.com/s/files/1/0429/5376/9126/files/2022661058.pdf
    • https://cdn.shopify.com/s/files/1/0430/9381/9541/files/kivoporixavuwagew.pdf
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/gidizapeposil.pdf
    • https://cdn.shopify.com/s/files/1/0433/8820/7255/files/cisco_ccna_2_packet_tracer_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/0537/7688/files/lizinadego.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_off00004db6.bin
fc52894e3e81cff8cf697a2f4576ce338b33f7feb963e62f3763d5922ae9a23b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB6 5196 bytes
font_01_sfnt_off00005f6d.bin
9d970f916a1fc2c9bf50269a18e32de795adb3988b4e1fac7f72aea5d1ab7ac1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6D 9612 bytes