Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d18a1f3853cac1…

MALICIOUS

PDF

38.1 KB Created: 2020-08-11 15:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ef34dc374e6baca4bca8585b23c2099 SHA-1: 9374754666d935cc6d79afd01a4d0f577f6bb0e6 SHA-256: 77d18a1f3853cac1b69350b82b805f98726c403effff85425f196db8300e285a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) that is flagged as malicious. The document body, though heavily obfuscated, also contains this malicious URL and numerous benign-looking URLs hosted on Shopify, likely to create a link farm. This suggests the primary purpose is to redirect users to malicious sites, potentially for phishing or malware distribution.

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=can+t+help+falling+in+love+with+you+chords+pdf
    • http://files.verityallenacupuncture.com/uploads/1/3/0/9/130969728/ninokur.pdf
    • http://dixepi.nordicflippedlearning.org/uploads/1/3/2/3/132302780/1037227.pdf
    • http://files.julianoshea.com/uploads/1/3/1/4/131453807/jibumojexoje.pdf
    • http://files.hairandmakeupcompany.co.uk/uploads/1/3/1/4/131406807/b9d80ccb78483.pdf
    • http://files.trinityjamestown.com/uploads/1/3/1/4/131414240/kevezatamov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0921/0529/files/winchester_model_190.pdf
    • https://cdn.shopify.com/s/files/1/0438/0891/5613/files/analiticka_geometrija_knjiga.pdf
    • https://cdn.shopify.com/s/files/1/0438/7006/0704/files/zufufenenoguke.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.pdf
    • https://cdn.shopify.com/s/files/1/0434/4784/5030/files/software_requirements_specification.pdf
    • https://cdn.shopify.com/s/files/1/0431/1554/4737/files/bratislava_attractions_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/1161/2572/files/semasebofava.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/gonezolivutifexun.pdf
    • https://cdn.shopify.com/s/files/1/0431/1325/0965/files/minafomabepuriwinawipixet.pdf
    • https://cdn.shopify.com/s/files/1/0439/1452/6872/files/agricultural_products_marketing.pdf
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/44449554553.pdf
    • https://cdn.shopify.com/s/files/1/0429/6205/9427/files/50504931922.pdf
    • https://cdn.shopify.com/s/files/1/0438/4099/5490/files/xutusiroxavegujegiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/6354/8831/files/live_tv_m3u.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5229/files/89570870920.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_off00004ecc.bin
ae70c2ddd67eb4fb029ce6c585653ca7a3e32b5bdfde08202887592d6f822b03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ECC 5576 bytes
font_01_sfnt_off000061d9.bin
b44879081dd8a13279ff5824f44cf456d1dc14ede9754c3cb391bb196e1fd997		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D9 12752 bytes

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