Malicious PDF — malware analysis report

Static analysis result for SHA-256 b093493429d6dea2…

MALICIOUS

PDF

44.4 KB Created: 2020-08-12 22:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e908dd398ad99a330c562948d8de479a SHA-1: 42d95d1953abddcef4e9a5bad70fb0433998772e SHA-256: b093493429d6dea2422e2a201aa33950568785d78ee8c33db6810ada6483097b
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic firing for a malicious redirector. The primary link, 'https://ttraff.com/pify?keyword=10+commandments+of+computer+ethics+pdf', is designed to lure users into clicking, likely leading to further malicious content. The document body itself is heavily obfuscated but contains the same URL, reinforcing the malicious intent. The ML classifier also 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=10+commandments+of+computer+ethics+pdf
    • http://files.uhriglab.com/uploads/1/3/2/7/132710780/9d2f1.pdf
    • http://files.wrapseshaz.com/uploads/1/3/0/8/130814283/4735917.pdf
    • http://sijikut.gandrrocks.com/uploads/1/3/2/3/132302780/ketodanexevupef-bifarib-dolubes.pdf
    • https://cdn.shopify.com/s/files/1/0431/8350/5570/files/karatigoxametomebekimuk.pdf
    • https://cdn.shopify.com/s/files/1/0436/9468/6376/files/ferawezesogogagemixasoru.pdf
    • https://cdn.shopify.com/s/files/1/0436/0319/8116/files/ad_hoc_network_protocols.pdf
    • https://cdn.shopify.com/s/files/1/0439/3671/0824/files/public_sector_budgeting_in_ghana.pdf
    • https://cdn.shopify.com/s/files/1/0437/1821/3797/files/kugoguwaz.pdf
    • https://cdn.shopify.com/s/files/1/0450/3647/0430/files/array_class_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/82408871218.pdf
    • https://cdn.shopify.com/s/files/1/0433/3358/2998/files/49215309222.pdf
    • https://cdn.shopify.com/s/files/1/0434/5698/7303/files/45491006677.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/rovifiku.pdf
    • https://cdn.shopify.com/s/files/1/0440/7400/8741/files/86587234987.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/69229232498.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_off000062de.bin
e06df07346e39467099e8d1d3d483f6b5af7fe3b3ca8e204c440301027fc4cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62DE 5344 bytes
font_01_sfnt_off000074c8.bin
b5b04710e7dc57856e03cfdca2f55095645e3f357a4f3264ffe7700d90728286		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C8 9852 bytes
font_02_sfnt_off00009679.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9679 4324 bytes

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