Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fb469f306eda20…

MALICIOUS

PDF

44.9 KB Created: 2020-08-17 00:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dce8a16d2b861bfd6a72032ce1add3ad SHA-1: cc89bfcbf7b8dd62d70d82368da5f7da84ae1cb8 SHA-256: d9fb469f306eda20557f952a5e32a95dcc04bbfe9aaaddee58305732e8d38717
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=cabal+mobile+apk+register'. This suggests the document's primary purpose is to redirect users to malicious content, likely related to the search term provided in the URL. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the payload.

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.cc/pify?keyword=cabal+mobile+apk+register
    • http://xaxarodot.escapetostjulians.rentals/uploads/1/3/1/4/131452861/0b751029722fdba.pdf
    • http://natupe.empyreandanes.com/uploads/1/3/1/4/131453902/zixijagododowe.pdf
    • http://temur.imaginerespiteservices.com/uploads/1/3/1/3/131383900/2326283.pdf
    • http://lotifen.jessicamattinglypsyd.com/uploads/1/3/2/6/132695399/eac20b.pdf
    • http://lusiropij.tributegiftsgp.com/uploads/1/3/2/8/132814930/26a3814e5d01.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4675/files/dagofonesezibejozutuvuv.pdf
    • https://cdn.shopify.com/s/files/1/0445/4796/5087/files/static_in_a_sentence.pdf
    • https://cdn.shopify.com/s/files/1/0435/6263/1326/files/15283674618.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4025/files/40008907259.pdf
    • https://cdn.shopify.com/s/files/1/0458/6605/7881/files/android_app_for_windows_keyboard.pdf
    • https://cdn.shopify.com/s/files/1/0431/0997/4169/files/sigma_aldrich_chemicals_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0434/3732/6488/files/vamatuxetebixekom.pdf
    • https://cdn.shopify.com/s/files/1/0450/9233/9877/files/calibration_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8129/files/51590289910.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4314/files/segid.pdf
    • https://cdn.shopify.com/s/files/1/0435/1783/7467/files/38481574728.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6566/files/puvutipefubirudukalo.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_off00005c6f.bin
ddaf882efe4ac1451dca9499056e06b16414c2ecb302238fea2d8ac5d7a7e00a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6F 5248 bytes
font_01_sfnt_off00006e35.bin
6a721acacbc4a0b27cc69f15f78db3641ab88c478bc75cf57e781ec92c243e04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E35 10280 bytes
font_02_sfnt_off000091ad.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91AD 16092 bytes

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