Malicious PDF — malware analysis report

Static analysis result for SHA-256 231d4115f52009b0…

MALICIOUS

PDF

57.7 KB Created: 2020-08-08 06:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2b4e30e0fb5a0cd3a25e619c71b3bb4 SHA-1: a03f162eacd6242a082c3ae8b76cc8599bf6dc46 SHA-256: 231d4115f52009b0d943f7d3ecd8d27ed8f86aa9317beb5b9513b0c9d364923a
150 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external links, suggesting a link farm. The primary malicious URL, 'https://ttraff.cc/pify?keyword=basic+elements+of+architectural+design+pdf', is identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to the same URL, reinforcing its role in the attack. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=basic+elements+of+architectural+design+pdf
    • http://files.therocksm.org/uploads/1/3/1/0/131070572/533100.pdf
    • http://files.jessedinkelphotography.com/uploads/1/3/0/8/130873769/ca8b7cb2.pdf
    • http://files.buildingourtomorrow.org/uploads/1/3/2/6/132695194/xabibovul.pdf
    • http://files.littlehamptonminiaturerailway.com/uploads/1/3/1/1/131164519/fufisipezi-rikafifujo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/rigaberorajoropop.pdf
    • https://cdn.shopify.com/s/files/1/0428/6591/8118/files/cnc_machine_definition.pdf
    • https://cdn.shopify.com/s/files/1/0434/6901/3157/files/pazazebivatulawe.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9432/files/engineering_economic_analysis_12th_edition_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/28874595199.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3615/files/brain_parts_and_functions.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/thermal_and_automobile_engineering_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/4079/8885/files/capparis_cartilaginea.pdf
    • https://cdn.shopify.com/s/files/1/0438/2880/5789/files/modobutanexi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/95758444267.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/8825824070.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/xonufapu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/puvudojakoxukene.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_off00009605.bin
0f3b8acd4e0cc061c81039027fc0e248b2818f7e01292c2951a17eca43f5c833
pdf-font-stream PDF embedded font (sfnt) at offset 0x9605 5500 bytes
font_01_sfnt_off0000a884.bin
6ae94bb730d04daab6c3f768f44e58de394c6af7c7ac526d1829ecf27d6f2818
pdf-font-stream PDF embedded font (sfnt) at offset 0xA884 10104 bytes
font_02_sfnt_off0000cb17.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB17 4324 bytes