Malicious PDF — malware analysis report

Static analysis result for SHA-256 4193c18ff2c41f99…

MALICIOUS

PDF

40.7 KB Created: 2020-08-08 22:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 331260c1396286e92ca480625a695e74 SHA-1: 0474fa63df4911800fcc3c21e1dc2410da6f433e SHA-256: 4193c18ff2c41f999195be7d376a2bfb07fff0daa3b508cb498a79e3bb6dd8ef
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which likely serves to obscure the ultimate malicious destination. The document body itself is largely unreadable, but the presence of the redirector and the sheer volume of links suggest a phishing or malware distribution attempt.

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=l+adjectif+possessif+pdf
    • http://files.drkaska.com/uploads/1/3/0/7/130776864/cc335a43cd561b0.pdf
    • http://files.mybigguns.net/uploads/1/3/1/4/131482976/zixekulux-kojanuxunoxa-negav.pdf
    • http://files.joyfulnoisepreschoolsandy.com/uploads/1/3/1/4/131437636/1828766.pdf
    • http://files.naturalstrandsofbeauty.co.uk/uploads/1/3/0/8/130813095/5155239.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/71777953171.pdf
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/xenugifuvugonolivero.pdf
    • https://cdn.shopify.com/s/files/1/0447/9621/5456/files/lil_durk_life_like_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/zimikub.pdf
    • https://cdn.shopify.com/s/files/1/0431/3569/7063/files/sunexoguvuvezaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/wuromu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0448/6055/files/what_is_validity_and_reliability_in_research.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89853177043.pdf
    • https://cdn.shopify.com/s/files/1/0428/3210/1543/files/90937253512.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/lotuzefiwurutilu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f7d.bin
2bbcf00fe33cf0d9ccad10f573de6394216289cf8db26d0d5df9a902cfbee5b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F7D 4720 bytes
font_01_sfnt_off00005f9c.bin
d098d32b7f838b23f3caca9198dfe85485814d2fae84f0f83eb92c4945bd47e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9C 12664 bytes
font_02_sfnt_off00008817.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x8817 4324 bytes