Malicious PDF — malware analysis report

Static analysis result for SHA-256 536d86b03519bcd9…

MALICIOUS

PDF

45.9 KB Created: 2020-08-31 02:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebac3fe0446c536260da3690bf50ea91 SHA-1: 9b169dab39b2591fa673bc4791d1dd685e6ab9cf SHA-256: 536d86b03519bcd9b83ded947fcec1e53d282d10d15208ea6623c3336be4a49c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to direct users to a malicious redirector at `ttraff.com`. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to GPS map downloads. The ML classifier strongly indicated maliciousness, and the presence of numerous external links to PDFs hosted on Shopify and other sites suggests a SEO poisoning or link farm tactic to distribute the 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/wix?keyword=mediatek+mt3351+gps+download+maps
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93016620893.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/berlitz_espanol.pdf
    • https://cdn.shopify.com/s/files/1/0429/6628/6490/files/89097645609.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77330784460.pdf
    • https://cdn.shopify.com/s/files/1/0429/4639/6326/files/law_office_procedures_manual_for_solos_and_small_firms.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9434/files/97333443922.pdf
    • https://static.usrfiles.com/ugd/e32576_4140634c3db5484ea591e25cdf020add.pdf
    • https://static.usrfiles.com/ugd/7f16bd_e95bdc313f6d4eceba6d8a11ba418b90.pdf
    • https://static.usrfiles.com/ugd/e32576_b29765e46e1543aca798a56811b4ffe2.pdf
    • https://static.usrfiles.com/ugd/4b7290_ba21e12170f54f2288ccbcd1f655e2ee.pdf
    • https://static.usrfiles.com/ugd/83b1b3_5e9e228d4ac24dcba9c0a60784065601.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/vixolorudezewolo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76102764406.pdf
    • https://cdn.shopify.com/s/files/1/0435/0754/8326/files/ihome_alarm_clock_manual.pdf
    • https://cdn.shopify.com/s/files/1/0462/7949/1733/files/jifudobatupudomaxop.pdf
    • https://cdn.shopify.com/s/files/1/0432/9763/6512/files/89485318517.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_off00005b62.bin
85ebc8fece6e5e5b3cb5605353d8a51200259806100add83fbed8bfd4161f0b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B62 5472 bytes
font_01_sfnt_off00006e0c.bin
f920dba3e11d08eb22395db78af6663419ff1ae99a1b76f8fcfc2fe45f5990db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0C 14724 bytes
font_02_sfnt_off00009c05.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C05 4324 bytes

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