Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95ea9e96807f09a…

MALICIOUS

PDF

33.3 KB Created: 2020-08-14 06:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ee152a569f8dc5c3326ecba0ec80c2d SHA-1: 03760190c1fea86633a9a3c90957dc9b077283a7 SHA-256: a95ea9e96807f09a322780a7d34f6fc27bddde9dab8f3ce710de6d2c678bfbc4
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on ttraff.com. This infrastructure is known to redirect to malicious content. The document body itself appears to be a lure, containing a title related to a technique guide, which is likely intended to trick users into clicking the malicious links. No scripts were extracted from this sample.

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=synthes+multiloc+humeral+nail+technique+guide
    • http://files.beagle-in-mind.org/uploads/1/3/1/4/131437849/piduk.pdf
    • http://fekapude.goodnews4thecounty.com/uploads/1/3/1/4/131453574/8305936.pdf
    • http://files.madbaglady.com/uploads/1/3/0/7/130776749/mexezukabodo-sekevazijeje.pdf
    • http://files.siriolsherlock.com/uploads/1/3/0/9/130968972/tobelawufela.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/siwanatol.pdf
    • https://cdn.shopify.com/s/files/1/0439/8628/8798/files/83995274514.pdf
    • https://cdn.shopify.com/s/files/1/0431/5624/2589/files/18775424476.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/2204594160.pdf
    • https://cdn.shopify.com/s/files/1/0439/5833/7694/files/audiomack_to_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0434/3028/1381/files/common_nouns_worksheet_year_1.pdf
    • https://cdn.shopify.com/s/files/1/0436/2131/8818/files/govudalusadinez.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rofan.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/analytical_chemistry_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0433/5874/8822/files/bhagavad_gita_online_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004587.bin
ce8cdf1ab16e9c1ca60b44f1809dad0ea779b1ee21ab8825488c05fd34d8dbcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x4587 5684 bytes
font_01_sfnt_off0000589b.bin
b5e72a6eddc0367bbd5a5ad2dc8b9773eb6363368df2e37b0c7105f2ae3dbc17
pdf-font-stream PDF embedded font (sfnt) at offset 0x589B 9264 bytes