Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac4d3c322bba89f…

MALICIOUS

PDF

40.3 KB Created: 2020-08-19 02:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8010243cb60c6af68299531e5f57e1bf SHA-1: 1f336970759ff6bc939658dba6ff279533c3dbe7 SHA-256: 4ac4d3c322bba89fe41f830f7cb9e3dd293ff6ea73b9ac369518ba39a8974e41
120 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, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, 'https://ttraff.cc/pify?keyword=physical+science+grade+11+exam+guidelines+2018'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure under the guise of providing exam guidelines. The presence of a link farm further supports the malicious intent.

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=physical+science+grade+11+exam+guidelines+2018
    • http://mekirib.everbriteabrasive.net/uploads/1/3/1/3/131379874/wodef-pixazopevora.pdf
    • http://files.albadrivingschool.com/uploads/1/3/2/8/132814306/2301697.pdf
    • http://manimu.artistshore.com/uploads/1/3/1/1/131163599/1914d9435def.pdf
    • http://files.txaddictionpain.org/uploads/1/3/1/4/131438348/8030468.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/nebuzoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/agitators_and_mixers.pdf
    • https://cdn.shopify.com/s/files/1/0437/0818/6792/files/toefl_speaking_topics_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/6105/1546/files/31818586298.pdf
    • https://cdn.shopify.com/s/files/1/0429/8083/5482/files/nintendo_dsi_operations_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/2817/5265/files/pomejamebipajediwonas.pdf
    • https://cdn.shopify.com/s/files/1/0431/1718/3130/files/42670801752.pdf
    • https://cdn.shopify.com/s/files/1/0436/3429/4937/files/84264758738.pdf
    • https://cdn.shopify.com/s/files/1/0434/1458/5509/files/93287479062.pdf
    • https://cdn.shopify.com/s/files/1/0448/0958/4802/files/paxful_bitcoin_wallet_apk.pdf
    • https://cdn.shopify.com/s/files/1/0455/7596/2789/files/didotaxowujatur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xazome.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/62396041106.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/80945563718.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_off0000555b.bin
6ad11d118af312d8d0248f882011b057997026e7c5db2bb348a4f0e3d3c5cfed
pdf-font-stream PDF embedded font (sfnt) at offset 0x555B 6044 bytes
font_01_sfnt_off000069bd.bin
fd9fa67c7dbf52d9ffdae35d4b83a1681bc25057d33f43df00f2009142bb61b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x69BD 13428 bytes