Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dd5be74bd6d216…

MALICIOUS

PDF

33.7 KB Created: 2020-08-11 09:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1a06ab2babc2de8e9bb4715e0808034 SHA-1: 935db1c51c090bb654a7ba35481710cd9d63647b SHA-256: 43dd5be74bd6d216791ce390b9b318f66352e1c0d87f61b2eab1bb1e73863ba3
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. The document body, though partially corrupted, contains text related to 'Algebra 2 common core teacher s edition pdf' and the malicious URL. The presence of a large number of external PDF links, many hosted on 'cdn.shopify.com', suggests a link farm or SEO poisoning attempt to disguise the malicious intent. The primary attack vector appears to be tricking the user into clicking the malicious link within the PDF.

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.com/pify?keyword=algebra+2+common+core+teacher+s+edition+pdf
    • http://gazumogun.lavelcustomcrowns.com/uploads/1/3/0/7/130738732/bedibujunorowej_wajuz_zukavove.pdf
    • http://files.gwensnewandused.org/uploads/1/3/1/3/131383771/dazifizekedudoka.pdf
    • http://nojob.cathysteeleart.com/uploads/1/3/1/8/131871478/5f48fdabfc44da.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.pdf
    • https://cdn.shopify.com/s/files/1/0428/8066/3715/files/computer_science_book_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0435/4804/9572/files/jquery_no_conflict_wordpress.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/jumbled_sentences_worksheets_for_grade_9.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/10316199176.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6727/files/67801842540.pdf
    • https://cdn.shopify.com/s/files/1/0431/8982/9800/files/42427664460.pdf
    • https://cdn.shopify.com/s/files/1/0431/3835/1255/files/liste_des_verbes_anglais_franais.pdf
    • https://cdn.shopify.com/s/files/1/0431/0191/3244/files/vopegofawuninob.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/brahms_lullaby_piano_sheet_music.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_off000043fc.bin
eada80e4f3926d8811f22352dd2165db1c003a88edf008337efc9ed70d826421		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43FC 5828 bytes
font_01_sfnt_off00005798.bin
e855cb9305e58e18b080013349c6c263e947781306d42c7bc2b220071eabc816		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5798 10060 bytes

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