Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1878dc6ca6d1b2…

MALICIOUS

PDF

55.6 KB Created: 2020-08-19 18:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e4d8ffd1138030212ef1d77991a049c SHA-1: 696004e6b77c4f946a13908d6d186d834c14fdb2 SHA-256: ae1878dc6ca6d1b208550eb4a1e14dc72ce993c1fbfa3142088434a09b9eaf49
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used in SEO poisoning or link farm attacks. One of the primary links, 'https://ttraff.ru/pify?keyword=short+forms+of+steganography', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and appears to contain the same URLs.

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.ru/pify?keyword=short+forms+of+steganography
    • http://files.mecasapreventiontoolkit.org/uploads/1/3/0/8/130874495/dovemugiv_bevawomumikaju.pdf
    • http://files.abbyvolcansek.com/uploads/1/3/1/3/131383456/xafejodenaxudilibof.pdf
    • http://files.seacreteconstruction.com/uploads/1/3/1/4/131453598/budire-gavizaxutilazi.pdf
    • http://files.vancouveriraniandentist.com/uploads/1/3/0/8/130874566/2f70bb.pdf
    • http://files.colleenscutecreations.com/uploads/1/3/1/4/131438068/8380078.pdf
    • https://cdn.shopify.com/s/files/1/0438/3929/1554/files/51591035916.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/nejapom.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1791/files/boston_marathon_training_plan.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/memasolonomomo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9389/2008/files/mojap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tawoxusabevesumaxev.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4620/files/fedipolademovov.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/74342159371.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007483.bin
10fa5f17e7b4bc9e18298d61cd5ee1cd03cee2a87b32d9fde9d0908a123be3bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7483 5228 bytes
font_01_sfnt_off00008620.bin
4ea06ef6385b34fc9dcd02c793345baf506a85261a45a709d70b32a1b6596e60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8620 11860 bytes
font_02_sfnt_off0000ade2.bin
b53d6cd9e61a9bf55c308423048ce67901af716d8fca3b1902784bf1a7acbf24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADE2 16208 bytes
font_03_sfnt_off0000c320.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC320 4324 bytes

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