Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0b9d6a56dc55ad…

MALICIOUS

PDF

58.3 KB Created: 2020-07-31 01:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f253983ae6e97ef2c105d482624f3e7c SHA-1: e9386b1c692c41d45530f01af527637c1a6f3a1f SHA-256: fc0b9d6a56dc55ad2b0c94f30f765471036b47ffe0efe3a3f6eefd7b768ab04a
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large farm of external PDF links. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be largely binary data, offering no clear user-facing content beyond metadata. The primary attack vector appears to be the extensive list of embedded URLs, with https://ttraff.com/ identified as a 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/pify?keyword=definition+of+mortality+rate+pdf
    • http://files.candyandfriends.com/uploads/1/3/1/3/131381976/buxogedinotizupitema.pdf
    • http://files.eastlakecongregational.org/uploads/1/3/2/3/132302916/6851984.pdf
    • http://files.cordeliabradby.com/uploads/1/3/0/7/130775980/23ad1f67a6c.pdf
    • http://files.striveacademy1.com/uploads/1/3/1/4/131483027/sexupawuvewex.pdf
    • http://files.womenartistsreaction.com/uploads/1/3/2/3/132302863/8d22be5d98d153.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/dejekerifotuwome.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/5009269775.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/tuwixor.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/45444997318.pdf
    • https://cdn.shopify.com/s/files/1/0430/3811/3955/files/kavekatevijobuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.pdf
    • https://cdn.shopify.com/s/files/1/0437/3823/5031/files/xetajoxeto.pdf
    • https://cdn.shopify.com/s/files/1/0430/9853/8151/files/lujanerugipurawusukafar.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/95558902380.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/63262184466.pdf
    • https://cdn.shopify.com/s/files/1/0437/7228/0993/files/404780154.pdf
    • https://cdn.shopify.com/s/files/1/0438/3975/0294/files/niguwoxezugoxum.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/
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000090f8.bin
1ef6c640aea2abb86107c3b27853d71e2a22cbc13dafc78ef59b064a00b64e39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90F8 4900 bytes
font_01_sfnt_off0000a18c.bin
7cf013daf5b705b4c3bba1ae81fc266db45ba6b0e510d23b7575667b11479375		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA18C 10828 bytes
font_02_sfnt_off0000c6cd.bin
c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CD 16060 bytes

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