Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cb87a7d57e04e9…

MALICIOUS

PDF

50.8 KB Created: 2020-08-13 05:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0b86772cb40cc61d59541b740df0b3a SHA-1: 9c367bc87f7da26f3cb58c1e5bec80bbed784c71 SHA-256: 50cb87a7d57e04e95e1347d09cab63b8e49d5646bb854592ddaf9a9f78894867
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The document body, though partially corrupted, contains text related to 'rent agreement format' and includes the malicious URL. The ML classifier strongly indicated maliciousness. The primary malicious URL is ttraff.cc, which redirects to further content, likely for phishing or malware delivery.

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/wb?keyword=rent%20agreement%20format%20in%20gujarati%20pdf
    • http://rasigifu.malti-pooscavalierkingcharlesspaniels.com/uploads/1/3/1/3/131380177/d3f244fddcf.pdf
    • http://files.solutionslocker.com/uploads/1/3/1/8/131871894/9739214.pdf
    • http://nepogi.baltimorereadaloud.shop/uploads/1/3/0/8/130874655/0e19e4a3.pdf
    • https://cdn.shopify.com/s/files/1/0434/7147/0742/files/tifofutejisima.pdf
    • https://cdn.shopify.com/s/files/1/0435/1492/1114/files/xesunejesupomupumuxuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2979/8818/files/56407323762.pdf
    • https://cdn.shopify.com/s/files/1/0428/3262/5831/files/love_after_marriage_urdu_novel_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1262/0447/files/51625543469.pdf
    • https://cdn.shopify.com/s/files/1/0438/3929/1554/files/solemofuvesufomum.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/69028166825.pdf
    • https://cdn.shopify.com/s/files/1/0428/2449/9367/files/tukek.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6940/files/fugamovawexodakoxalokabem.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5271/files/tipupapixazifipexek.pdf
    • https://cdn.shopify.com/s/files/1/0438/5590/4918/files/32168689719.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_off00007e4b.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4B 2828 bytes
font_01_sfnt_off00008845.bin
be224953b2af0acf977370e320b5c1316e3c930e4e321b3a5a99e894df49598a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8845 5236 bytes
font_02_sfnt_off00009a08.bin
886faed408ac432b4f4ce6483230760b0b8399ed29c599e2dabe2b0f08e7ae2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A08 9820 bytes