Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5b2c62f20dd509…

MALICIOUS

PDF

39.4 KB Created: 2020-08-20 02:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed0b759b449e1855d6605e9c50322e67 SHA-1: 763874ffc686827f8bbd7c6136e83b67bfbb6a87 SHA-256: ad5b2c62f20dd509bc04c2a6a785a59871cfe08afe9f7659692aca63dfe22b67
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including a critical redirector link to 'ttraff.com', suggesting a phishing or malware distribution lure. The document body, though heavily obfuscated, contains text related to 'Islamic amharic books free pdf' and the malicious URL, reinforcing the lure. The presence of a link farm and the ML classifier's high confidence score indicate malicious intent. No scripts were extracted, but the PDF structure itself is used for the attack.

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=islamic+amharic+books+free++pdf
    • http://files.oberonmassage.com/uploads/1/3/0/8/130813841/bijemaz.pdf
    • http://nuvunop.starlightdancecamps.com/uploads/1/3/0/7/130775726/e51ad864303a10c.pdf
    • http://files.localreachconsulting.com/uploads/1/3/0/7/130776016/13abf0a0d873.pdf
    • http://files.vanforum.org/uploads/1/3/1/1/131163859/e3a42857.pdf
    • http://luwakuz.michellemorganphotography.net/uploads/1/3/2/6/132681393/dc95976178.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99781003244.pdf
    • https://cdn.shopify.com/s/files/1/0436/1663/2992/files/dibogamaduluxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3455/0173/files/56264447146.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/jomajinafudozajo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4017/7314/files/75472302413.pdf
    • https://cdn.shopify.com/s/files/1/0437/8460/1758/files/45475624560.pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7467/files/asus_android_adb_interface_driver_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4021/files/ruvum.pdf
    • https://cdn.shopify.com/s/files/1/0431/0836/8545/files/70570808814.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5237/files/37470034389.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/waxasobazafadikopisusu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6054/3138/files/48121252974.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_off0000463d.bin
266e9fbab552e3fabaeb848521b6f53e42222d78362c18da59bc0b595efb2ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x463D 7928 bytes
font_01_sfnt_off00005acf.bin
3aed307d7c3f4fbd22192fed2ae6d8632104184d4207101f7420545fe1c91518		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ACF 5536 bytes
font_02_sfnt_off00006d6a.bin
158415462897e3b1f92bf364cb5a5e0ee7b47cc5df19c73eb7a03c09da08e47b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6A 10148 bytes

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