Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f2b28cf221b57e…

MALICIOUS

PDF

50.2 KB Created: 2020-08-10 18:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c626d73b192398c803d961f856ae958a SHA-1: 72311ea978e0c0cdb1163b080d93077d22e0c3c6 SHA-256: d7f2b28cf221b57e884368785359b70714088417f95010a8fca878a4749f31af
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and heuristics indicate it contains a malicious redirector link and a large number of external PDF links, suggesting a link farm for SEO manipulation or malware distribution. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword suggesting a lure for a specific document. The document body contains garbled text but also includes the malicious URL and several other URLs hosted on Shopify and other domains, some of which are unknown or potentially malicious.

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.ru/pify?keyword=the+power+of+forgetting+mike+byster+pdf
    • http://files.cynchitpants.com/uploads/1/3/1/4/131407194/xebut.pdf
    • http://files.rasa-music.com/uploads/1/3/0/7/130776847/temamaramamibir.pdf
    • http://files.coljonesswimhurstville.com.au/uploads/1/3/2/7/132741181/9628755.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/46989678410.pdf
    • https://cdn.shopify.com/s/files/1/0432/2351/5300/files/arabic_words_meaning_in_urdu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/3095/4655/files/.pdf
    • https://cdn.shopify.com/s/files/1/0434/7753/2822/files/gozajogijisa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5891/3689/files/taxedejo.pdf
    • https://cdn.shopify.com/s/files/1/0444/3412/9062/files/c_language_aptitude_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/8153/0534/files/vozopudox.pdf
    • https://cdn.shopify.com/s/files/1/0436/2610/2947/files/joxebuziwo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4085/0598/files/garowupeten.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3128/files/92689979152.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16216600544.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6773/files/jirulitobabazetujejodi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/79800300633.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_off00006d7e.bin
fb0887809a4c2f03293e4fa4907a1ed54ac97e2919e7552db6e98db8084d8c19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7E 5560 bytes
font_01_sfnt_off0000804f.bin
77087b43a29045b865e7c8794ec092d8b2d4495d825fed3a034a15edf38eadc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x804F 10776 bytes
font_02_sfnt_off0000a501.bin
c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA501 16092 bytes

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