Malicious PDF — malware analysis report

Static analysis result for SHA-256 985543ec529dbb02…

MALICIOUS

PDF

43.3 KB Created: 2020-08-23 14:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 245f054683d9bf6ec2f1ae2c046bed11 SHA-1: 6d0cc96550e400d3b2918eea7ac73023b80f3d02 SHA-256: 985543ec529dbb0288b2d2e900a0931279d3cb33305f59c2e909cf644a11294f
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Adobe photoshop free trial software', suggesting a lure for users to click on the malicious links. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to known malicious infrastructure.

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=adobe+photoshop+free+trial+software
    • http://files.bigpinelodgebooks.com/uploads/1/3/1/8/131857734/pokavag.pdf
    • http://files.flipbookpublishing.shop/uploads/1/3/0/8/130874587/mojef_jalamev_lonebekadulin.pdf
    • https://cdn.shopify.com/s/files/1/0436/6978/2693/files/ruzukapezibexubetasak.pdf
    • https://cdn.shopify.com/s/files/1/0431/5581/6608/files/wedding_program_thank_you.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/nozeriforutok.pdf
    • https://cdn.shopify.com/s/files/1/0436/3275/4841/files/employee_attendance_management_system_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/5376/9126/files/papirepe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/79522146912.pdf
    • https://cdn.shopify.com/s/files/1/0433/9066/4860/files/47920650833.pdf
    • https://cdn.shopify.com/s/files/1/0430/2084/5210/files/nugixufulizefeguxezo.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_off00005ef7.bin
6e7c73472b19aa032398f4b5dfa37134b21446dceaf6241ca3815c580e9d1f1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF7 5032 bytes
font_01_sfnt_off00007034.bin
3e469b88a88d9f65525fc6249f3bb25610af4d47e8d34f099771052ef64fcd4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7034 10016 bytes
font_02_sfnt_off00009274.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9274 4324 bytes