Malicious PDF — malware analysis report

Static analysis result for SHA-256 b837cb5fe5503e07…

MALICIOUS

PDF

34.1 KB Created: 2020-08-18 14:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08dde8eed8845963fccbf5b5d8583a22 SHA-1: 6dc09570985c041e0a9ae32021c71d753d9eb66c SHA-256: b837cb5fe5503e07848b6fb98dc0b5bd8c048d158c7f947275b5a17735fce70a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links redirects to a known malicious redirector at 'ttraff.ru', which is likely used to distribute further malware. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector confirms a high likelihood of a phishing or malware distribution attempt.

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=ms+powerpoint+themes+free++2010
    • http://files.sistahsonlit.com/uploads/1/3/2/7/132710712/dixilutojirazun_fuzirunuxopi_raralutoragiz_duzokuxigubo.pdf
    • http://pelib.starrglasscreations.com/uploads/1/3/1/4/131407283/860d92.pdf
    • https://cdn.shopify.com/s/files/1/0429/3374/7878/files/guardian_tokens_borderlands_3.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9768/files/vunimakiximugum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89120948070.pdf
    • https://cdn.shopify.com/s/files/1/0437/8004/6997/files/veselasusosatudodopemune.pdf
    • https://cdn.shopify.com/s/files/1/0429/2745/6419/files/basic_electrical_engineering_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/pobifekadalisa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5522/6773/files/nozuxoko.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/ham_radio_bands.pdf
    • https://cdn.shopify.com/s/files/1/0440/5788/6870/files/71131846316.pdf
    • https://cdn.shopify.com/s/files/1/0431/9186/1412/files/55179547591.pdf
    • https://cdn.shopify.com/s/files/1/0428/6670/4550/files/netflix_hacked_apk_quora.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/69451255661.pdf
    • https://cdn.shopify.com/s/files/1/0440/3943/8501/files/73022452510.pdf
    • https://cdn.shopify.com/s/files/1/0430/8172/8151/files/sapotosu.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_off00004a10.bin
2ac58d68be0f124b92d386256f518204f7e22593970eac969912baee932c5ccc
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A10 5324 bytes
font_01_sfnt_off00005c26.bin
0723740d64c198d5f9b0ecdca643a4e01be9c93afa7f1804c85c7fd046ac0c1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C26 9220 bytes