Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3963ab03f7a1ede…

MALICIOUS

PDF

52.9 KB Created: 2020-09-02 02:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17190db840539ee1ca1d83b06b101509 SHA-1: 49d43aa74e24f41f6a13313fb8907205f541c05c SHA-256: a3963ab03f7a1edec1c7b63c9d8a0add0c08c66a0c5725a5f1ea8f4f364a5b17
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, likely as part of an SEO link farm. However, one critical link redirects to a known malicious domain, ttraff.ru. The document body, though heavily obfuscated, contains the text 'Car damping sheets' and the malicious URL, suggesting a lure to disguise the malicious redirection.

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.ru/wix?keyword=car+damping+sheets
    • https://cdn.shopify.com/s/files/1/0447/8153/5389/files/aludecor_acp_sheet_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/68267839972.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/mijakumasodagigarozuxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/danivofoxufilow.pdf
    • https://cdn.shopify.com/s/files/1/0430/3041/3475/files/dowifoketo.pdf
    • https://cdn.shopify.com/s/files/1/0440/2846/1206/files/siwixixibelenipodelorarid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68513135127.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tijubijevuvikupox.pdf
    • https://cdn.shopify.com/s/files/1/0436/0490/2045/files/33622268728.pdf
    • https://cdn.shopify.com/s/files/1/0434/3644/1767/files/ayaya_ayaya_song.pdf
    • https://static.usrfiles.com/ugd/e3834b_a136fc9f1358427da3a56d198c59398f.pdf
    • https://static.usrfiles.com/ugd/fac845_f6977f1abd5441fb8d230906603a2752.pdf
    • https://static.usrfiles.com/ugd/3eed2b_3c8b8b1149904c12892b7c7a3bfb6545.pdf
    • https://static.usrfiles.com/ugd/64d889_76b16e731d5e497a9f0b9c95b2fadf98.pdf
    • https://static.usrfiles.com/ugd/ccb1c6_73f4f0e971e4414e8f23471b6d257bd7.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_off00007ba2.bin
eee91bc99de9469ac8f54252cd874d19df53938022bd9afdeac5dbfea08da3b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA2 5244 bytes
font_01_sfnt_off00008d49.bin
65798b42b13425eca8906a33b11a6989b03aae66b7f1830aa579cf077ed3ac6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D49 10532 bytes
font_02_sfnt_off0000b16f.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB16F 16164 bytes