Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3160e5e34457318…

MALICIOUS

PDF

57.4 KB Created: 2020-08-21 19:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3927b9fa3347fbee2c26be9cbbbdf8a5 SHA-1: ce62e5aa0348cd83efdd3cbe59c073fa9a2a488c SHA-256: e3160e5e34457318b549671c4c5d9776b8e8d75290463b557c80d321a663b030
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the same redirector URL. The presence of numerous links to Shopify-hosted PDFs suggests a link farm technique to improve search engine ranking and lure victims. The ML classifier strongly indicated maliciousness.

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=aircraft+accident+investigation+pdf
    • http://files.elmermeats.com/uploads/1/3/1/3/131380480/9076105.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1522/files/85192619444.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4008/files/53837099869.pdf
    • https://cdn.shopify.com/s/files/1/0431/9897/2066/files/78294033322.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/55675114719.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/80181515865.pdf
    • https://cdn.shopify.com/s/files/1/0440/9032/7205/files/human_body_anatomy_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0434/3755/5868/files/79536175275.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1378/files/woropuzap.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/7967170765.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/87520491223.pdf
    • https://cdn.shopify.com/s/files/1/0433/5524/2655/files/rizojegipimotowelek.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000084cc.bin
0bfdabc6fc51c37fcbde2862eec0997f6ee19a91477ba65698a315ce145fa390		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x84CC 12400 bytes
font_00_sfnt_off00006126.bin
a9a01bc0a24455e19a528938643e2b42675aa7efed3b3cc1fec709e6a49bfc52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6126 5272 bytes
font_01_sfnt_off00007359.bin
9570612a7a1064f57eb3b47fb9f9674bcbb98a7d5639978e9e8c2ef329a4b8c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7359 5128 bytes
font_03_sfnt_off0000a768.bin
f4892ec4855293769ecf75f02089990b0d46be61ece8d4e2d6b270044c35cb26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA768 10212 bytes
font_04_sfnt_off0000ca06.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA06 4324 bytes

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