Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e399547f362c7a2…

MALICIOUS

PDF

42.3 KB Created: 2020-09-02 07:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f9d72439891580aca8f719663145649 SHA-1: ff3fbf4a60dfd6a279eab53508533183d785a6e9 SHA-256: 5e399547f362c7a26e79bd1a4a98c9ef9daa8012a48a4d7586f5d5b6bd45f224
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a datasheet title and references the malicious URL. The ML classifier also strongly indicated maliciousness. The presence of many links to Shopify PDFs suggests an attempt to blend in with legitimate content while directing users to malicious sites.

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=bjt+547+b+datasheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0464/7560/8214/files/ergobaby_front_carry.pdf
    • https://cdn.shopify.com/s/files/1/0437/1087/3750/files/diphenoxylate_davis.pdf
    • https://cdn.shopify.com/s/files/1/0437/4829/4807/files/93106325137.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/49834898550.pdf
    • https://cdn.shopify.com/s/files/1/0432/6070/6971/files/23513568061.pdf
    • https://cdn.shopify.com/s/files/1/0470/6304/0168/files/25077597197.pdf
    • https://cdn.shopify.com/s/files/1/0428/7492/9319/files/39296291445.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/82090200328.pdf
    • https://cdn.shopify.com/s/files/1/0430/9513/0266/files/lorozopidi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/texirid.pdf
    • https://cdn.shopify.com/s/files/1/0437/7886/7351/files/78575570791.pdf
    • https://cdn.shopify.com/s/files/1/0437/3538/4225/files/rapidex_english_speaking_course_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74133662670.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/39387787086.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/zirujofazifibebadobimux.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/88735387982.pdf
    • https://cdn.shopify.com/s/files/1/0434/2428/4824/files/before_i_go_to_sleep_full_book_download.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_off00006686.bin
7d10477e17a2df18a9b29ba875ebb4f1c8d36d10ac5b0e5f82b1f8505ce92bd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6686 5340 bytes
font_01_sfnt_off000078c6.bin
9f6ae7e47059626fb52a69fb6a89e709e80201ef1a395e2f55bd336b721feb33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C6 11072 bytes

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