Malicious PDF — malware analysis report

Static analysis result for SHA-256 192ded0aa6868dda…

MALICIOUS

PDF

38.2 KB Created: 2020-08-23 08:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a30574ac7a4d418e97e8380f696ed3dd SHA-1: add0185539c3d7662f4c14d2a6e5afce8b360b29 SHA-256: 192ded0aa6868ddabdeb0a084ff523302610dab43a56ad56b327e6188a7fc04b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one to a known malicious redirector at 'https://ttraff.com/pify?keyword=adverbs+in+english+exercises+pdf'. The document body, though heavily obfuscated, appears to be a lure related to English exercises, aiming to disguise the malicious intent. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious link farm.

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=adverbs+in+english+exercises+pdf
    • http://seriwe.huffmansflowersofthefield.com/uploads/1/3/0/7/130739892/jopegutoro.pdf
    • http://xiwol.moonphasegoddessshop.com/uploads/1/3/1/4/131407241/dosiwemusojavolu.pdf
    • http://files.williammonaguenativeart.com/uploads/1/3/1/6/131637919/vapurisadeneju_votatujitonufi.pdf
    • http://files.carolineheffernanactor.com/uploads/1/3/2/7/132740253/4c349f0c5aa83.pdf
    • http://files.dianneodell.com/uploads/1/3/1/4/131407233/totomukemojuv-lofagixe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/detupokijuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/xasiru.pdf
    • https://cdn.shopify.com/s/files/1/0435/5335/7985/files/85176004647.pdf
    • https://cdn.shopify.com/s/files/1/0428/2508/9191/files/wevajo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8589/7627/files/jikis.pdf
    • https://cdn.shopify.com/s/files/1/0450/4364/6614/files/oxford_discover_1_grammar_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/6231/3631/files/pixemusewovadewerabagi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/dreamweaver_8_php_mysql_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0441/2047/3752/files/zifuvi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1952/5531/files/calpeda_ctm_61.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/32574053957.pdf
    • https://cdn.shopify.com/s/files/1/0435/6803/8049/files/angularjs_5_tutorial_franais.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/rijujodidubaxok.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005731.bin
ac96d2d5d0d1512a11adf05dfd009ce22610e468199aaeaaf9678a9ce95007ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5731 5464 bytes
font_01_sfnt_off000069c0.bin
661cbdcc4b1ebfd045862a18aa015a69e7b294510c3c49e720f4e2c9f4b076e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C0 9972 bytes

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