Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f103ad49515ed11…

MALICIOUS

PDF

71.3 KB Created: 2020-07-29 14:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbdbb3c29c88810ac6aa7c70a0a73738 SHA-1: cbcceab0dd1f379ef3c1c7b447ab53b0283d8abb SHA-256: 4f103ad49515ed11dd3d91ec4cc25719923c920a7bf97af5129d49146401aafa
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a link farm, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Sahih Bukhari Shareef PDF'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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=sahih+bukhari+shareef+pdf
    • http://files.branfordartcenterct.com/uploads/1/3/0/7/130740412/c4b7e6c41be9.pdf
    • http://files.helenernstlongarmquilting.com/uploads/1/3/0/9/130969926/4142889.pdf
    • http://files.cristinaperez.tv/uploads/1/3/0/7/130739590/pifuku.pdf
    • http://files.rachelfoxfrazier.com/uploads/1/3/1/4/131452840/bujuvofuxexowevaku.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/duzotanevebinepasimaje.pdf
    • https://cdn.shopify.com/s/files/1/0436/0519/6957/files/kilirijebulasakosujez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12584167006.pdf
    • https://cdn.shopify.com/s/files/1/0434/5649/5783/files/mimowesatus.pdf
    • https://cdn.shopify.com/s/files/1/0428/1093/3414/files/40099098853.pdf
    • https://cdn.shopify.com/s/files/1/0428/5110/6972/files/36082023997.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0111/files/sotov.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/bolaxexosutemedu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9602/3975/files/poteju.pdf
    • https://cdn.shopify.com/s/files/1/0436/3301/6982/files/57626327157.pdf
    • https://cdn.shopify.com/s/files/1/0429/1582/3772/files/59697219868.pdf
    • https://cdn.shopify.com/s/files/1/0435/3199/3242/files/55462530236.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98223768302.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56802730071.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
stream_008_off0000e8fe.bin
cce30127844a02f7ba5ceb406ffe18f85d9000326f9838745b8e459c02b2cb33		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE8FE 22292 bytes
font_00_sfnt_off0000b46c.bin
7694a86862859b87827eb9d4f82de93f56cd39408fb4b9b07d42d0a403721feb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB46C 4988 bytes
font_01_sfnt_off0000c55e.bin
d3f7c75cd73cfd41abbeac577d7f6edd41fa20cb6f96fb883382e187fbea9cb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC55E 10620 bytes

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