Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31fbd0b6cd65f68…

MALICIOUS

PDF

51.9 KB Created: 2020-08-09 11:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa6e244bf3944139746c3a2fa84c87a9 SHA-1: abe069d410ffd5234a9e05919b5c40d8e7f85bcf SHA-256: a31fbd0b6cd65f68db1570153403bb09b8c97896548e1f94d96005b4399d27fb
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector, indicating a phishing or scam attempt. The primary malicious URL, 'https://ttraff.cc/pify?keyword=biography+of+chinua+achebe+pdf', is designed to lure users into clicking by appearing to offer a biography PDF. The presence of numerous other PDF links, many hosted on Shopify, suggests a tactic to manipulate search engine results for malicious redirection.

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.cc/pify?keyword=biography+of+chinua+achebe+pdf
    • http://bewuwo.yourfamilycomfort.com/uploads/1/3/1/0/131070109/rusidazif.pdf
    • http://files.tfpoist.com/uploads/1/3/1/0/131069934/97d1181b0d.pdf
    • http://files.everythingpixar.com/uploads/1/3/0/7/130739214/vatorimoxivukolusev.pdf
    • http://files.comeaucarpentry.com/uploads/1/3/1/4/131437508/df0e1cfe.pdf
    • http://files.caledonheritagefoundation.com/uploads/1/3/2/3/132303320/b2890e8ac0ab.pdf
    • https://cdn.shopify.com/s/files/1/0434/0632/7959/files/89637648666.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/battlestar_galatica_season_4.pdf
    • https://cdn.shopify.com/s/files/1/0432/8020/3944/files/cbse_class_2_maths_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/4904/8474/files/bukunogodarebokil.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/2526442888.pdf
    • https://cdn.shopify.com/s/files/1/0434/3247/6838/files/lepomefelixuzemuwiza.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/kurajovuwurafosixapowezo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9257/3336/files/rafaxojifunuxuned.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/delobetajuluz.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7193/files/47882366470.pdf
    • https://cdn.shopify.com/s/files/1/0432/8708/5220/files/futudokunuwugagofesomu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1164/files/nigeria_accounting_standard_board.pdf
    • https://cdn.shopify.com/s/files/1/0438/1304/4386/files/advertising_techniques_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/1604/3168/files/fokisusomon.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_off00008d4a.bin
228c4bd4636555e00f23e258987c878a736264e5550c4d7dd6f83e7217149a27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4A 5500 bytes
font_01_sfnt_off0000a004.bin
3193c169324d32d5636c2b5019e59334996a8d3b884352929cc2a4142c7f94d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA004 10040 bytes

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